:root {
  color-scheme: light;
  --ink: #493735;
  --muted: #927a75;
  --paper: #fffaf6;
  --rose: #c96f78;
  --rose-dark: #a9515d;
  --gold: #c59758;
  --board: #d9c4bb;
  --gap: clamp(8px, 2.4vw, 12px);
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html,
body {
  margin: 0;
  width: 100%;
  min-height: 100%;
  overflow: hidden;
  overscroll-behavior: none;
}

body {
  height: 100dvh;
  display: grid;
  place-items: center;
  overflow-x: hidden;
  color: var(--ink);
  font-family: "Noto Serif SC", "Songti SC", "STSong", serif;
  background:
    radial-gradient(circle at 15% 8%, rgba(232, 180, 176, 0.24) 0 80px, transparent 81px),
    radial-gradient(circle at 90% 90%, rgba(204, 167, 112, 0.2) 0 100px, transparent 101px),
    linear-gradient(150deg, #fffaf6, #f7ebe7 56%, #f5e5df);
}

button {
  color: inherit;
  font: inherit;
  border: 0;
  cursor: pointer;
}

.game-shell {
  width: min(100%, 480px);
  padding: max(20px, env(safe-area-inset-top)) 18px max(20px, env(safe-area-inset-bottom));
}

.game-header,
.score-row,
.story-card {
  display: flex;
  align-items: center;
}

.game-header {
  justify-content: space-between;
  margin-bottom: 16px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.difficulty-button {
  min-height: 38px;
  padding: 0 13px;
  border: 1px solid rgba(169, 81, 93, 0.18);
  border-radius: 999px;
  color: var(--rose-dark);
  font-family: system-ui, sans-serif;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  background: rgba(255, 250, 246, 0.72);
  box-shadow: 0 5px 18px rgba(111, 71, 64, 0.08);
}

.difficulty-button.classic {
  color: var(--muted);
}

.eyebrow {
  margin: 0 0 2px;
  color: var(--rose);
  font-family: system-ui, sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.28em;
}

h1 {
  margin: 0;
  font-size: clamp(32px, 9vw, 44px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: 0.08em;
}

.sound-button {
  width: 42px;
  height: 42px;
  border: 1px solid rgba(169, 81, 93, 0.18);
  border-radius: 50%;
  color: var(--rose-dark);
  background: rgba(255, 250, 246, 0.72);
  box-shadow: 0 5px 18px rgba(111, 71, 64, 0.08);
}

.sound-button.muted {
  color: #b8a6a1;
}

.score-row {
  gap: 9px;
  margin-bottom: 12px;
}

.score-card {
  position: relative;
  min-width: 72px;
  padding: 8px 12px;
  text-align: center;
  border: 1px solid rgba(145, 111, 99, 0.12);
  border-radius: 14px;
  background: rgba(255, 250, 246, 0.74);
}

.score-card span,
.story-card span {
  display: block;
  color: var(--muted);
  font-family: system-ui, sans-serif;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.score-card strong {
  font-family: ui-rounded, "Arial Rounded MT Bold", system-ui, sans-serif;
  font-size: 20px;
}

#scoreGain {
  position: absolute;
  top: -5px;
  right: 8px;
  color: var(--rose-dark);
  font-family: system-ui, sans-serif;
  font-size: 13px;
  font-style: normal;
  font-weight: 800;
  opacity: 0;
}

#scoreGain.pop {
  animation: score-pop 650ms ease-out;
}

.new-game-button {
  min-height: 56px;
  flex: 1;
  border-radius: 15px;
  color: #fffaf6;
  font-weight: 700;
  letter-spacing: 0.08em;
  background: var(--rose);
  box-shadow: 0 7px 16px rgba(169, 81, 93, 0.2);
}

.new-game-button:active {
  transform: translateY(1px);
}

.story-card {
  min-height: 66px;
  margin-bottom: 12px;
  padding: 10px 12px;
  gap: 10px;
  border: 1px solid rgba(178, 139, 112, 0.16);
  border-radius: 17px;
  background: rgba(255, 250, 246, 0.68);
}

.rank-seal {
  width: 42px;
  height: 42px;
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  color: #fff9f0;
  font-size: 20px;
  font-weight: 800;
  border-radius: 50% 50% 46% 46%;
  background: var(--rose);
  box-shadow: inset 0 0 0 3px rgba(255, 255, 255, 0.22);
}

.story-card strong {
  display: block;
  margin-top: 1px;
  font-size: 19px;
}

.story-card p {
  flex: 1;
  margin: 0;
  color: var(--muted);
  font-family: system-ui, sans-serif;
  font-size: 11px;
  line-height: 1.5;
  text-align: right;
}

.board-wrap {
  position: relative;
}

.board {
  --cell: calc((100% - var(--gap) * 5) / 4);
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: 22px;
  background: var(--board);
  box-shadow:
    inset 0 0 0 1px rgba(93, 61, 54, 0.06),
    0 16px 40px rgba(97, 63, 57, 0.12);
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-user-drag: none;
  contain: layout paint;
}

.cell {
  position: absolute;
  width: var(--cell);
  height: var(--cell);
  border-radius: 16px;
  background: rgba(255, 247, 242, 0.46);
  left: calc(var(--gap) + var(--col) * (var(--cell) + var(--gap)));
  top: calc(var(--gap) + var(--row) * (var(--cell) + var(--gap)));
}

.tile {
  position: absolute;
  z-index: 2;
  width: var(--cell);
  height: var(--cell);
  display: grid;
  place-items: center;
  padding: 5px;
  border-radius: 16px;
  color: var(--tile-ink, #5f4540);
  text-align: center;
  background: var(--tile-bg, #f7e9df);
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.35),
    0 4px 9px rgba(82, 54, 49, 0.1);
  left: calc(var(--gap) + var(--col) * (var(--cell) + var(--gap)));
  top: calc(var(--gap) + var(--row) * (var(--cell) + var(--gap)));
  pointer-events: none;
  -webkit-user-drag: none;
}

.tile-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.tile-name {
  font-size: clamp(16px, 5.2vw, 26px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.03em;
}

.tile-flower {
  --flower-size: 13px;
  position: relative;
  width: var(--flower-size);
  height: var(--flower-size);
  display: block;
  flex: 0 0 auto;
  color: currentColor;
  opacity: 0.58;
}

.flower-petal,
.flower-heart,
.flower-jewel,
.flower-crown {
  position: absolute;
  display: block;
}

.flower-petal {
  left: 39%;
  top: 6%;
  width: 24%;
  height: 43%;
  border-radius: 55% 55% 42% 42%;
  background: currentColor;
  transform-origin: 50% 100%;
}

.petal-two { transform: rotate(72deg); }
.petal-three { transform: rotate(144deg); }
.petal-four { transform: rotate(216deg); }
.petal-five { transform: rotate(288deg); }

.flower-heart {
  z-index: 2;
  left: 38%;
  top: 38%;
  width: 27%;
  height: 27%;
  border-radius: 50%;
  background: var(--tile-bg, #f7e9df);
  box-shadow: inset 0 0 0 1px currentColor;
}

.flower-jewel,
.flower-crown {
  display: none;
}

.tile[data-level="3"] .tile-flower,
.tile[data-level="4"] .tile-flower,
.tile[data-level="5"] .tile-flower {
  --flower-size: 16px;
  opacity: 0.7;
}

.tile[data-level="3"] .flower-heart,
.tile[data-level="4"] .flower-heart,
.tile[data-level="5"] .flower-heart {
  background: var(--gold);
  box-shadow: 0 0 0 1px rgba(255, 250, 235, 0.72);
}

.tile[data-level="6"] .tile-flower,
.tile[data-level="7"] .tile-flower,
.tile[data-level="8"] .tile-flower {
  --flower-size: 20px;
  opacity: 0.92;
  filter: drop-shadow(0 1px 1px rgba(80, 35, 42, 0.2));
}

.tile[data-level="6"] .flower-petal,
.tile[data-level="7"] .flower-petal,
.tile[data-level="8"] .flower-petal {
  background: #ffe5b3;
}

.tile[data-level="6"] .flower-heart,
.tile[data-level="7"] .flower-heart,
.tile[data-level="8"] .flower-heart {
  background: #b34f63;
  box-shadow: 0 0 0 1px #fff1cc;
}

.tile[data-level="6"] .flower-jewel,
.tile[data-level="7"] .flower-jewel,
.tile[data-level="8"] .flower-jewel {
  display: block;
  top: 70%;
  width: 14%;
  height: 26%;
  border-radius: 50% 50% 60% 60%;
  background: #ffe5b3;
}

.jewel-left {
  left: 13%;
  transform: rotate(24deg);
}

.jewel-right {
  right: 13%;
  transform: rotate(-24deg);
}

.tile[data-level="9"] .tile-flower,
.tile[data-level="10"] .tile-flower,
.tile[data-level="11"] .tile-flower,
.tile[data-level="12"] .tile-flower {
  --flower-size: 24px;
  opacity: 1;
  color: #fff0bd;
  filter: drop-shadow(0 1px 2px rgba(64, 29, 31, 0.34));
}

.tile[data-level="9"] .flower-heart,
.tile[data-level="10"] .flower-heart,
.tile[data-level="11"] .flower-heart,
.tile[data-level="12"] .flower-heart {
  background: #a83f56;
  box-shadow: 0 0 0 1px #fff2c7, 0 0 5px rgba(255, 226, 154, 0.6);
}

.tile[data-level="9"] .flower-jewel,
.tile[data-level="10"] .flower-jewel,
.tile[data-level="11"] .flower-jewel,
.tile[data-level="12"] .flower-jewel {
  display: block;
  top: 70%;
  width: 14%;
  height: 27%;
  border-radius: 50% 50% 60% 60%;
  background: #ffe09a;
}

.tile[data-level="9"] .flower-crown,
.tile[data-level="10"] .flower-crown,
.tile[data-level="11"] .flower-crown,
.tile[data-level="12"] .flower-crown {
  display: block;
  left: 20%;
  top: -27%;
  width: 62%;
  height: 34%;
  border-bottom: 2px solid #ffe09a;
  background:
    linear-gradient(62deg, transparent 45%, #ffe09a 46% 63%, transparent 64%) left / 45% 100% no-repeat,
    linear-gradient(-62deg, transparent 45%, #ffe09a 46% 63%, transparent 64%) right / 45% 100% no-repeat;
}

.tile[data-level="11"] .tile-flower,
.tile[data-level="12"] .tile-flower {
  animation: flower-glow 1600ms ease-in-out infinite alternate;
}

.tile.new {
  animation: tile-appear 170ms ease-out;
}

.tile.merged {
  animation: tile-merge 220ms ease-out;
}

.tile[data-level="1"] { --tile-bg: #f7ebe3; }
.tile[data-level="2"] { --tile-bg: #f3ded5; }
.tile[data-level="3"] { --tile-bg: #ebcfc8; }
.tile[data-level="4"] { --tile-bg: #e7bbb8; }
.tile[data-level="5"] { --tile-bg: #dca2a5; --tile-ink: #653f43; }
.tile[data-level="6"] { --tile-bg: #cf858e; --tile-ink: #fff8f3; }
.tile[data-level="7"] { --tile-bg: #bd6f7d; --tile-ink: #fff8f3; }
.tile[data-level="8"] { --tile-bg: #a95667; --tile-ink: #fff9f2; }
.tile[data-level="9"] { --tile-bg: #8c4357; --tile-ink: #fff9ed; }
.tile[data-level="10"] { --tile-bg: #c49a5b; --tile-ink: #fffdf3; }
.tile[data-level="11"] {
  --tile-bg: linear-gradient(145deg, #d7b76e, #a96e38);
  --tile-ink: #fffdf3;
  box-shadow: 0 0 22px rgba(197, 151, 88, 0.58);
}

.tile[data-level="12"] {
  --tile-bg: linear-gradient(145deg, #f0d78f, #a75a48 72%);
  --tile-ink: #fffdf3;
  box-shadow: 0 0 28px rgba(214, 172, 88, 0.72);
}

.game-message {
  position: absolute;
  z-index: 10;
  inset: 0;
  display: none;
  place-items: center;
  padding: 24px;
  border-radius: 22px;
  background: rgba(78, 51, 48, 0.58);
  backdrop-filter: blur(4px);
}

.game-message.visible {
  display: grid;
  animation: fade-in 220ms ease-out;
}

.message-card {
  width: min(100%, 300px);
  padding: 28px 22px 22px;
  border-radius: 22px;
  text-align: center;
  background: var(--paper);
  box-shadow: 0 15px 40px rgba(57, 36, 34, 0.22);
}

.message-flower {
  color: var(--gold);
  font-size: 32px;
}

.message-card h2 {
  margin: 7px 0 4px;
  font-size: 28px;
}

.message-card p {
  margin: 0 0 20px;
  color: var(--muted);
  font-family: system-ui, sans-serif;
  font-size: 14px;
}

.message-actions {
  display: flex;
  gap: 8px;
}

.message-actions button {
  flex: 1;
  padding: 11px 8px;
  border-radius: 12px;
  color: #fff;
  background: var(--rose);
}

.message-actions button + button {
  color: var(--rose-dark);
  background: #f1ded9;
}

.promotion-toast {
  min-height: 25px;
  padding-top: 8px;
  color: var(--rose-dark);
  font-size: 14px;
  font-weight: 700;
  text-align: center;
  opacity: 0;
}

.promotion-toast.show {
  animation: toast 1200ms ease-in-out;
}

footer {
  color: var(--muted);
  font-family: system-ui, sans-serif;
  font-size: 11px;
  text-align: center;
}

footer p {
  margin: 3px 0;
}

.rank-path {
  opacity: 0.72;
}

.mobile-tip {
  display: none;
}

@keyframes tile-appear {
  from { opacity: 0; scale: 0.6; }
}

@keyframes tile-merge {
  50% { scale: 1.12; }
}

@keyframes flower-glow {
  from { filter: drop-shadow(0 1px 2px rgba(64, 29, 31, 0.3)); }
  to { filter: drop-shadow(0 0 5px rgba(255, 235, 177, 0.92)); }
}

@keyframes score-pop {
  0% { opacity: 1; transform: translateY(5px); }
  100% { opacity: 0; transform: translateY(-18px); }
}

@keyframes toast {
  0%, 100% { opacity: 0; transform: translateY(4px); }
  15%, 78% { opacity: 1; transform: translateY(0); }
}

@keyframes fade-in {
  from { opacity: 0; }
}

@media (max-width: 520px) {
  body {
    place-items: start center;
  }

  .game-shell {
    padding-left: 14px;
    padding-right: 14px;
  }

  .desktop-tip {
    display: none;
  }

  .mobile-tip {
    display: inline;
  }
}

@media (max-height: 720px) {
  .game-shell {
    padding-top: 10px;
    padding-bottom: 10px;
  }

  .game-header {
    margin-bottom: 8px;
  }

  h1 {
    font-size: 31px;
  }

  .story-card {
    min-height: 57px;
  }

  footer {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 1ms !important;
    transition-duration: 1ms !important;
  }
}