@font-face { font-family: "Alibaba PuHuiTi"; src: url("/fonts/alibaba-puhuiti-regular-site.woff2?v=20260906") format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Alibaba PuHuiTi"; src: url("/fonts/alibaba-puhuiti-medium-site.woff2?v=20260906") format("woff2"); font-weight: 500; font-display: swap; }
@font-face { font-family: "Alibaba PuHuiTi"; src: url("/fonts/alibaba-puhuiti-semibold-site.woff2?v=20260906") format("woff2"); font-weight: 600; font-display: swap; }
@font-face { font-family: "QianTu HouHei"; src: url("/fonts/qiantu-houhei-site.woff2?v=20260906") format("woff2"); font-weight: 800; font-display: swap; }

:root {
  color-scheme: light;
  --ink: #101820;
  --ink-soft: #2f3a44;
  --smoke: #65717b;
  --mist: #f3f5f6;
  --stage: #e7edf0;
  --white: #ffffff;
  --line: rgba(16, 24, 32, 0.15);
  --blue: #315f9f;
  --danger: #c84e45;
  --shadow: 0 24px 58px rgba(16, 24, 32, 0.15);
  font-family: "Alibaba PuHuiTi", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { background: var(--mist); }
body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--mist);
  -webkit-font-smoothing: antialiased;
  overscroll-behavior-y: none;
}
button, a { -webkit-tap-highlight-color: transparent; }
button { color: inherit; font: inherit; }
::selection { color: var(--white); background: var(--ink); }

.game-header {
  width: min(1380px, calc(100% - 48px));
  height: 76px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
.game-brand { width: 118px; height: 48px; display: grid; place-items: center; }
.game-brand img { display: block; width: 100%; height: 100%; object-fit: contain; }
.game-back {
  min-height: 44px;
  padding: 0 16px;
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink);
  background: var(--white);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

/* A compact title and optional rules keep the play area in one clear column. */
.game-layout { width: min(1280px, calc(100% - 48px)); margin: 0 auto; padding: 0 0 56px; }
.game-breadcrumb { min-height: 58px; display: flex; flex-wrap: wrap; align-items: center; gap: 10px; border-bottom: 1px solid var(--line); color: var(--smoke); font-size: 13px; }
.game-breadcrumb a { min-height: 44px; display: inline-flex; align-items: center; color: inherit; text-decoration: none; }
.game-breadcrumb a::after { content: "/"; margin-left: 10px; color: var(--smoke); opacity: .5; }
.game-breadcrumb span { color: #101820; font-weight: 500; }
.game-titlebar { padding: 28px 0 24px; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 28px; align-items: end; }
.game-titlebar h1 { margin: 0; font-family: "QianTu HouHei", "Alibaba PuHuiTi", sans-serif; font-size: clamp(42px, 5.3vw, 68px); font-weight: 800; line-height: 1; }
.game-titlebar p { max-width: 48em; margin: 14px 0 0; color: var(--smoke); font-size: 15px; line-height: 1.75; }
.game-title-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.game-quiet-button { min-height: 46px; padding: 0 17px; display: inline-flex; align-items: center; justify-content: center; border: 1px solid var(--line); border-radius: 12px; color: #101820; background: #fff; font-size: 14px; font-weight: 500; text-decoration: none; cursor: pointer; }
.game-quiet-button[aria-expanded="true"] { border-color: #101820; background: #f3f5f6; }
.game-quiet-button:hover { border-color: #101820; }
.game-instructions { margin: 0 0 20px; padding: 22px 24px; border: 1px solid var(--line); border-radius: 16px; background: #fff; }
.game-instructions[hidden] { display: none; }
.game-instructions-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.game-instructions-heading h2 { margin: 0; font-size: 22px; }
.game-instructions-heading .game-quiet-button { flex-shrink: 0; min-height: 44px; font-size: 12px; }
.game-instructions > p { max-width: 76em; margin: 16px 0 0; color: var(--ink-soft); font-size: 13px; line-height: 1.75; }
.game-rules { margin-top: 20px; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; }
.game-rules p { min-width: 0; margin: 0; padding: 15px 0 0; display: grid; align-content: start; gap: 6px; border-top: 1px solid var(--line); }
.game-rules strong { font-size: 14px; font-weight: 600; }
.game-rules span { color: var(--smoke); font-size: 13px; line-height: 1.65; }
.game-instructions .game-help { color: var(--smoke); text-align: left; }

.game-stage { width: 100%; min-width: 0; }

.game-status { margin: 0 0 10px; display: grid; grid-template-columns: repeat(3, minmax(84px, 0.72fr)) minmax(220px, 1.55fr); gap: 7px; }
.game-status p {
  min-width: 0;
  min-height: 50px;
  margin: 0;
  padding: 8px 12px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--white);
}
.game-status span { color: var(--smoke); font-size: 12px; font-weight: 600; }
.game-status strong { font-size: 23px; font-variant-numeric: tabular-nums; letter-spacing: -0.025em; line-height: 1; }
.game-status .game-mission {
  padding-inline: 14px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-align: left;
  pointer-events: none;
}
.game-status .game-mission strong { overflow: hidden; font-size: 12px; font-weight: 600; line-height: 1.3; text-overflow: ellipsis; white-space: nowrap; }
.game-status .game-mission small { color: var(--smoke); font-size: 10px; font-variant-numeric: tabular-nums; white-space: nowrap; }

.game-board {
  position: relative;
  width: 100%;
  height: clamp(460px, calc(100svh - 300px), 600px);
  overflow: hidden;
  border-radius: 24px;
  background: var(--stage);
  box-shadow: var(--shadow);
  isolation: isolate;
  touch-action: none;
}
.game-board::after {
  content: "";
  position: absolute;
  inset: 10px;
  z-index: 3;
  border: 2px solid rgba(49, 95, 159, 0);
  border-radius: 16px;
  pointer-events: none;
}
.game-board.is-merge::after { animation: merge-board-pulse 520ms cubic-bezier(0.16, 1, 0.3, 1); }
.game-board.is-danger { box-shadow: 0 24px 58px rgba(200, 78, 69, 0.27); }
#stack-canvas {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  display: block;
  cursor: grab;
  outline: none;
  touch-action: none;
}
#stack-canvas:active { cursor: grabbing; }

.game-next,
.game-host {
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 10px 28px rgba(16, 24, 32, 0.11);
}
.game-next {
  position: absolute;
  z-index: 5;
  top: 12px;
  left: 12px;
  min-width: 124px;
  padding: 7px 9px;
  display: grid;
  gap: 2px;
  color: var(--ink);
  pointer-events: none;
}
.game-next span, .game-next small { color: var(--smoke); font-size: 10px; font-style: normal; }
.game-next strong { font-size: 14px; }
.game-next em {
  margin-top: 2px;
  color: var(--blue);
  font-size: 10px;
  font-style: normal;
  font-weight: 600;
}
.game-danger {
  position: absolute;
  z-index: 5;
  top: 14px;
  right: 14px;
  width: min(156px, 25%);
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 9px;
  pointer-events: none;
}
.game-danger > span { color: var(--smoke); font-size: 10px; font-weight: 600; }
.game-danger i { height: 8px; overflow: hidden; border-radius: 999px; background: rgba(16, 24, 32, 0.14); }
.game-danger b {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: inherit;
  background: var(--danger);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 110ms linear;
}

.game-host {
  position: absolute;
  z-index: 5;
  left: 10px;
  bottom: 10px;
  width: min(166px, 25%);
  margin: 0;
  padding: 6px 8px 6px 6px;
  display: grid;
  grid-template-columns: 40px 1fr;
  align-items: center;
  gap: 7px;
  border: 1px solid rgba(16, 24, 32, 0.1);
  pointer-events: none;
}
.game-host img { width: 40px; height: 46px; padding: 3px; object-fit: contain; object-position: center; border-radius: 8px; background: var(--mist); }
.game-host p { margin: 0; color: var(--ink-soft); font-size: 12px; line-height: 1.5; }

.game-controls {
  width: 100%;
  margin-top: 10px;
  display: grid;
  grid-template-columns: minmax(48px, 0.58fr) minmax(58px, 0.7fr) minmax(132px, 1.3fr) minmax(58px, 0.7fr) minmax(48px, 0.58fr);
  gap: 6px;
}
.game-controls button, .game-primary {
  min-width: 0;
  min-height: 44px;
  padding: 0 9px;
  border: 1px solid rgba(16, 24, 32, 0.15);
  border-radius: 12px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.95);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 9px 25px rgba(16, 24, 32, 0.11);
}
.game-controls .game-drop { border-color: var(--ink); color: var(--white); background: var(--ink); font-size: 14px; box-shadow: none; }
.game-primary { border-color: var(--ink); color: var(--white); background: var(--ink); font-size: 14px; }
.game-controls button:disabled, .game-primary:disabled { cursor: default; opacity: 0.46; }
.game-controls button:active:not(:disabled), .game-primary:active:not(:disabled) { transform: translateY(1px) scale(0.99); }
.game-controls kbd {
  margin-left: 5px;
  padding: 2px 5px;
  border: 1px solid currentColor;
  border-radius: 8px;
  font-family: inherit;
  font-size: 9px;
  font-weight: 500;
  opacity: 0.56;
}

.game-message {
  position: absolute;
  right: 10px;
  bottom: 10px;
  z-index: 5;
  width: min(250px, 32%);
  min-height: 36px;
  margin: 0;
  padding: 7px 10px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(16, 24, 32, 0.1);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 10px 28px rgba(16, 24, 32, 0.11);
  color: var(--smoke);
  font-size: 12px;
  font-weight: 600;
  text-align: center;
  pointer-events: none;
}
.game-message:empty { visibility: hidden; }

.game-overlay {
  position: absolute;
  inset: 0;
  z-index: 10;
  padding: clamp(22px, 5vw, 48px);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  background: rgba(231, 237, 240, 0.82);
}
.game-overlay[hidden] { display: none; }
.game-overlay-copy {
  width: min(390px, 70%);
  padding: 26px;
  border-radius: 16px;
  background: var(--white);
  box-shadow: 0 18px 44px rgba(16, 24, 32, 0.15);
}
.game-overlay-copy h2 {
  margin: 0;
  font-family: "QianTu HouHei", "Alibaba PuHuiTi", sans-serif;
  font-size: clamp(30px, 3.5vw, 44px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.08;
}
.game-overlay-copy p { margin: 14px 0 23px; color: var(--ink-soft); font-size: 14px; line-height: 1.7; }
.game-primary { width: 100%; box-shadow: none; }
.game-overlay-copy > a { display: block; margin-top: 14px; color: var(--smoke); font-size: 12px; text-align: center; text-underline-offset: 4px; }

.game-help { margin: 13px 5px 0; color: var(--smoke); font-size: 12px; line-height: 1.6; text-align: center; }

:focus-visible { outline: 3px solid var(--ink); outline-offset: 3px; }

@keyframes merge-board-pulse {
  0% { border-color: rgba(49, 95, 159, 0.74); transform: scale(0.986); }
  100% { border-color: rgba(49, 95, 159, 0); transform: scale(1); }
}

@media (hover: hover) and (pointer: fine) {
  .game-back:hover { border-color: var(--ink); }
  .game-controls button:hover:not(:disabled), .game-primary:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 13px 30px rgba(16, 24, 32, 0.15); }
}

@media (max-width: 1080px) {
  .game-header { width: min(780px, calc(100% - 32px)); }
  .game-board { height: clamp(460px, calc(100svh - 250px), 600px); }
}

@media (max-width: 640px) {
  .game-header { width: calc(100% - 28px); height: 64px; }
  .game-brand { width: 96px; height: 40px; }
  .game-back { min-height: 44px; padding: 0 12px; font-size: 12px; }
  .game-status { margin-inline: 2px; grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .game-status p { min-height: 58px; padding: 9px 10px; }
  .game-status strong { font-size: 23px; }
  .game-status .game-mission { grid-column: 1 / -1; min-height: 50px; grid-template-columns: auto minmax(0, 1fr) auto; }
  .game-board { height: min(136vw, 560px); aspect-ratio: auto; border-radius: 16px; }
  .game-next { top: 10px; left: 10px; min-width: 122px; padding: 8px 10px; }
  .game-danger { top: 13px; right: 11px; width: 35%; }
  .game-host { display: none; }
  .game-host img { width: 40px; height: 48px; padding: 3px; }
  .game-host p { font-size: 12px; }
  .game-controls { right: 8px; bottom: max(8px, env(safe-area-inset-bottom)); left: 8px; grid-template-columns: minmax(44px, .65fr) minmax(44px, .75fr) minmax(0, 1.2fr) minmax(44px, .75fr) minmax(44px, .65fr); gap: 5px; }
  .game-controls button { min-height: 54px; padding: 0 4px; font-size: 12px; }
  .game-controls .game-drop { font-size: 15px; }
  .game-controls kbd { display: none; }
  .game-message { right: 10px; bottom: 10px; width: min(190px, 58%); min-height: 34px; padding: 6px 8px; font-size: 12px; }
  .game-overlay { padding: 16px; align-items: center; justify-content: center; }
  .game-overlay-copy { width: min(88%, 390px); padding: 20px; }
  .game-overlay-copy h2 { font-size: 28px; letter-spacing: -0.025em; }
}

@media (max-width: 370px) {
  .game-controls { gap: 4px; }
  .game-controls button { min-height: 50px; font-size: 12px; }
  .game-host { display: none; }
}

@media (pointer: coarse) {
  .game-controls button { min-height: 52px; }
  #stack-canvas { cursor: default; }
}


@media (max-width: 720px) {
  .game-layout { width: calc(100% - 28px); padding-bottom: 40px; }
  .game-breadcrumb { min-height: 50px; gap: 8px; font-size: 12px; }
  .game-breadcrumb a::after { margin-left: 8px; }
  .game-titlebar { padding: 24px 0 20px; grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .game-titlebar h1 { font-size: clamp(40px, 10.8vw, 56px); }
  .game-titlebar p { margin-top: 12px; font-size: 14px; line-height: 1.65; }
  .game-title-actions .game-quiet-button { min-height: 44px; padding-inline: 16px; font-size: 13px; }
  .game-instructions { padding: 16px; margin-bottom: 16px; }
  .game-instructions-heading { gap: 10px; }
  .game-instructions-heading h2 { font-size: 20px; }
  .game-instructions-heading .game-quiet-button { padding-inline: 12px; }
  .game-rules { grid-template-columns: minmax(0, 1fr); gap: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}

@media (forced-colors: active) {
  .game-board, .game-next, .game-host, .game-overlay-copy { border: 1px solid CanvasText; }
}