:root {
  --bg: #16130f;
  --bg-lift: #211c16;
  --paper: #f3ead8;
  --paper-deep: #e7dcc4;
  --ink: #241d14;
  --ink-soft: #5b5043;
  --line: #c9b89a;
  --gold: #c4921a;
  --gold-bright: #e4b84a;
  --rose: #b44a3c;
  --ok: #3f6b48;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  --radius: 22px;
  --cell: 52px;
  --font: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --display: "Noto Serif TC", "Songti TC", serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  touch-action: manipulation;
  background:
    radial-gradient(circle at 12% 8%, rgba(228, 184, 74, 0.12), transparent 28%),
    radial-gradient(circle at 88% 0%, rgba(180, 74, 60, 0.1), transparent 26%),
    var(--bg);
  color: var(--paper);
  font-family: var(--font);
}

body {
  min-height: 100dvh;
}

button {
  font-family: inherit;
  cursor: pointer;
}

.app {
  width: min(720px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 40px;
}

.screen[data-visible="false"] {
  display: none;
}

.brand {
  text-align: center;
  margin: 28px 0 36px;
}

.brand-mark {
  width: 72px;
  height: 72px;
  margin: 0 auto 16px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: linear-gradient(160deg, #3a3124, #1b1712);
  box-shadow: inset 0 0 0 1px rgba(228, 184, 74, 0.28), 0 10px 24px rgba(0, 0, 0, 0.28);
}

.brand-mark svg {
  width: 42px;
  height: 42px;
  fill: var(--gold-bright);
  filter: drop-shadow(0 0 8px rgba(228, 184, 74, 0.45));
}

.eyebrow {
  margin: 0 0 6px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  font-size: 12px;
  color: var(--gold-bright);
}

.brand h1 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(48px, 10vw, 72px);
  letter-spacing: 0.18em;
  font-weight: 700;
}

.tagline {
  margin: 12px auto 0;
  max-width: 22em;
  color: #d8ccb6;
  line-height: 1.7;
}

.campaign-panel {
  display: grid;
  gap: 12px;
  justify-items: stretch;
}

.progress-block {
  padding: 20px 18px 16px;
  border-radius: 18px;
  background: linear-gradient(180deg, #2a241c, #1d1914);
  box-shadow: inset 0 0 0 1px rgba(243, 234, 216, 0.06);
  text-align: center;
}

.progress-kicker {
  margin: 0;
  letter-spacing: 0.18em;
  font-size: 12px;
  color: var(--gold-bright);
}

.progress-count {
  margin: 8px 0 12px;
  font-family: var(--display);
  font-size: 34px;
}

.progress-bar {
  height: 8px;
  border-radius: 999px;
  background: #3a3228;
  overflow: hidden;
}

.progress-bar span {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, #c4921a, #e4b84a);
}

.continue-hint {
  margin: 12px 0 0;
  color: #c9bba4;
  font-size: 13px;
  line-height: 1.6;
}

.continue-btn {
  width: 100%;
  min-height: 52px;
  font-size: 16px;
}

.levels-dialog {
  width: min(560px, 100%);
}

.chapter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.chapter-tab {
  border: 0;
  border-radius: 999px;
  padding: 6px 12px;
  background: #e7dcc4;
  color: var(--ink);
  font-size: 13px;
}

.chapter-tab.is-active {
  background: var(--ink);
  color: var(--paper);
}

.level-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 14px;
}

.level-cell {
  min-height: 42px;
  border: 0;
  border-radius: 10px;
  background: #e7dcc4;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.level-cell.is-cleared {
  background: #d8c27a;
}

.level-cell.is-current {
  box-shadow: inset 0 0 0 2px var(--ink);
}

.level-cell.is-locked {
  opacity: 0.38;
  cursor: default;
}

.level-pager {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 14px;
  color: var(--ink-soft);
  font-size: 13px;
}

.difficulty-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.difficulty-card {
  appearance: none;
  border: 0;
  text-align: left;
  padding: 18px 18px 16px;
  border-radius: 18px;
  background: linear-gradient(180deg, #2a241c, #1d1914);
  color: var(--paper);
  box-shadow: inset 0 0 0 1px rgba(243, 234, 216, 0.06);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.difficulty-card:hover,
.difficulty-card:focus-visible {
  transform: translateY(-2px);
  box-shadow: inset 0 0 0 1px rgba(228, 184, 74, 0.4), 0 12px 28px rgba(0, 0, 0, 0.25);
  outline: none;
}

.difficulty-card .size {
  font-family: var(--display);
  font-size: 28px;
  margin: 0 0 4px;
}

.difficulty-card .label {
  margin: 0;
  color: var(--gold-bright);
  font-size: 14px;
}

.difficulty-card .blurb {
  margin: 10px 0 0;
  color: #c9bba4;
  font-size: 13px;
  line-height: 1.6;
}

.text-btn,
.ghost-btn,
.solid-btn,
.icon-btn {
  border: 0;
}

.text-btn {
  display: block;
  margin: 28px auto 0;
  background: none;
  color: #d2c4aa;
  font-size: 15px;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.play-bar {
  display: grid;
  grid-template-columns: 44px 1fr 44px;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.icon-btn {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: #2a241c;
  color: var(--paper);
  display: grid;
  place-items: center;
}

.icon-btn svg {
  width: 22px;
  height: 22px;
}

.play-meta {
  text-align: center;
}

.play-difficulty {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--gold-bright);
}

.play-score-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  flex: 0 0 48px;
  width: 48px;
}

.play-score {
  margin: 0;
  font-family: var(--display);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--paper);
  line-height: 1;
}

.play-score-caption {
  margin: 0;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  padding-left: 0.16em;
  line-height: 1.45;
  text-align: center;
  color: #d2c4aa;
}

.play-score-bar {
  position: relative;
  flex: 1 1 auto;
  width: 16px;
  border-radius: 999px;
  background: rgba(243, 234, 216, 0.14);
  overflow: hidden;
}

.play-score-bar span {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(to top, #3f6b48 0%, var(--gold-bright) 55%, #b44a3c 100%);
  clip-path: inset(100% 0 0 0);
}

.play-timer {
  margin: 4px 0 0;
  font-family: var(--display);
  font-variant-numeric: tabular-nums;
  font-size: 32px;
  font-weight: 700;
  line-height: 1.1;
}

.play-spacer {
  width: 44px;
  height: 44px;
}

.lives {
  display: none;
}

.heart {
  width: 18px;
  height: 18px;
  color: var(--rose);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.heart.is-lost {
  opacity: 0.22;
  transform: scale(0.86);
  color: #8a7b6a;
}

.play-board {
  display: flex;
  align-items: stretch;
  gap: 12px;
}

.board-stage {
  position: relative;
  flex: 1 1 auto;
  min-width: 0;
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}

.board-loading {
  position: absolute;
  inset: 0;
  display: none;
  place-items: center;
  background: rgba(243, 234, 216, 0.92);
  border-radius: inherit;
  z-index: 2;
  font-family: var(--display);
  letter-spacing: 0.12em;
}

.board-loading.is-on {
  display: grid;
}

.board {
  display: grid;
  width: 100%;
  margin: 0 auto;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  touch-action: none;
  background: #b9a888;
}

.cell {
  position: relative;
  aspect-ratio: 1;
  border: 1px solid rgba(36, 29, 20, 0.08);
  display: grid;
  place-items: center;
  padding: 0;
  appearance: none;
  cursor: pointer;
  touch-action: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}

.cell.edge-t { border-top-width: 3px; border-top-color: var(--ink); }
.cell.edge-b { border-bottom-width: 3px; border-bottom-color: var(--ink); }
.cell.edge-l { border-left-width: 3px; border-left-color: var(--ink); }
.cell.edge-r { border-right-width: 3px; border-right-color: var(--ink); }

.cell:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: -3px;
  z-index: 1;
}

.mark {
  width: 58%;
  height: 58%;
  pointer-events: none;
}

.mark.is-drop {
  transform-origin: center;
  animation: mark-drop 1s cubic-bezier(0.33, 0, 0.2, 1) both;
}

@keyframes mark-drop {
  from {
    transform: scale(2);
  }
  to {
    transform: scale(1);
  }
}

.cell.is-dropping {
  z-index: 2;
  overflow: visible;
}

.mark-star {
  fill: #2a2116;
  filter: drop-shadow(0 1px 0 rgba(255, 255, 255, 0.2));
}

.board.is-showcase {
  pointer-events: none;
}

.board.is-showcase .mark-cross,
.board.is-showcase .hint-q {
  opacity: 0.12;
}

.cell.is-gold {
  perspective: 180px;
  z-index: 3;
  overflow: visible;
}

.gold-flip {
  width: 72%;
  height: 72%;
  position: relative;
  display: grid;
  place-items: center;
  transform-style: preserve-3d;
  animation: gold-flip 1s cubic-bezier(0.4, 0.12, 0.2, 1) both;
}

.gold-star {
  width: 100%;
  height: 100%;
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
}

.gold-star-front {
  fill: #f0c64a;
  filter:
    drop-shadow(0 1px 0 #fff3b0)
    drop-shadow(0 3px 0 #9a7014)
    drop-shadow(0 6px 8px rgba(122, 82, 8, 0.35))
    drop-shadow(0 0 10px rgba(228, 184, 74, 0.55));
}

.gold-star-back {
  fill: #a67c16;
  transform: rotateY(180deg);
  filter: drop-shadow(0 2px 2px rgba(0, 0, 0, 0.25));
}

@keyframes gold-flip {
  0% {
    transform: rotateY(0deg) scale(1);
  }
  42% {
    transform: rotateY(180deg) scale(1.22);
  }
  100% {
    transform: rotateY(360deg) scale(1.1);
  }
}

.mark-cross {
  stroke: #4a4033;
  stroke-width: 2.2;
  stroke-linecap: round;
}

.cell.is-wrong {
  animation: wrong-flash 0.42s ease;
}

.cell.is-revealed .mark-star {
  fill: #8a6a20;
  opacity: 0.55;
}

@keyframes wrong-flash {
  0%,
  100% { box-shadow: none; }
  35% { box-shadow: inset 0 0 0 999px rgba(180, 74, 60, 0.38); }
}

.toolbar {
  margin-top: 18px;
  display: grid;
  gap: 12px;
  justify-items: center;
}

.reason-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.reason-switch {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  color: #d8ccb6;
  font-size: 14px;
}

.reason-clear {
  min-height: 32px;
  padding: 0 12px;
  border: 0;
  border-radius: 999px;
  background: #2a241c;
  color: #d8ccb6;
  font-size: 13px;
  box-shadow: inset 0 0 0 1px rgba(243, 234, 216, 0.08);
}

.reason-clear:hover:not(:disabled) {
  color: var(--paper);
  box-shadow: inset 0 0 0 1px rgba(196, 146, 26, 0.45);
}

.reason-clear:disabled {
  opacity: 0.38;
  cursor: default;
}

.reason-switch input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.reason-ui {
  width: 42px;
  height: 24px;
  border-radius: 999px;
  background: #2a241c;
  box-shadow: inset 0 0 0 1px rgba(243, 234, 216, 0.08);
  position: relative;
}

.reason-ui::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #c9b89a;
  transition: transform 0.18s ease, background 0.18s ease;
}

.reason-switch input:checked + .reason-ui {
  background: #4a3a18;
  box-shadow: inset 0 0 0 1px rgba(228, 184, 74, 0.45);
}

.reason-switch input:checked + .reason-ui::after {
  transform: translateX(18px);
  background: var(--gold-bright);
}

.reason-switch input:checked ~ .reason-text {
  color: var(--gold-bright);
}

.board-stage.is-reason {
  box-shadow: var(--shadow), 0 0 0 2px rgba(196, 146, 26, 0.7);
}

.cell.is-hint .mark-star {
  fill: none;
  stroke: #2a2116;
  stroke-width: 1.5;
  opacity: 0.72;
}

.cell.is-hint .mark-cross {
  stroke-dasharray: 3.2 2.4;
  opacity: 0.7;
}

.hint-q {
  position: absolute;
  right: 12%;
  top: 6%;
  font-size: 11px;
  font-weight: 700;
  color: #2a2116;
  line-height: 1;
  pointer-events: none;
}

.hint {
  margin: 0;
  color: #c9b89a;
  font-size: 13px;
}

.toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.ghost-btn,
.solid-btn {
  min-height: 42px;
  padding: 0 16px;
  border-radius: 12px;
  font-size: 14px;
}

.ghost-btn {
  background: #2a241c;
  color: var(--paper);
}

.solid-btn {
  background: var(--gold);
  color: #1b1408;
  font-weight: 700;
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(12, 10, 8, 0.62);
  display: grid;
  place-items: center;
  padding: 20px;
  z-index: 10;
}

.overlay[hidden] {
  display: none;
}

.dialog {
  width: min(440px, 100%);
  background: var(--paper);
  color: var(--ink);
  border-radius: 20px;
  padding: 28px 24px 22px;
  box-shadow: var(--shadow);
}

.dialog h2 {
  margin: 0 0 14px;
  font-family: var(--display);
  letter-spacing: 0.12em;
}

.rules-list {
  margin: 0 0 14px;
  padding-left: 1.2em;
  line-height: 1.8;
}

.rules-note {
  margin: 0 0 20px;
  color: var(--ink-soft);
  line-height: 1.7;
}

.result-kicker {
  margin: 0 0 6px;
  color: var(--ok);
  letter-spacing: 0.16em;
  font-size: 13px;
}

.result-dialog.is-lose .result-kicker {
  color: var(--rose);
}

.result-copy {
  margin: 0 0 22px;
  color: var(--ink-soft);
  line-height: 1.7;
}

.result-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

@media (max-width: 640px) {
  .app {
    width: min(100% - 20px, 720px);
    padding-top: 18px;
  }

  .difficulty-grid {
    grid-template-columns: 1fr;
  }

  .level-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .board-stage {
    padding: 10px;
  }

  .play-board {
    gap: 8px;
  }

  .play-score-wrap {
    flex-basis: 42px;
    width: 42px;
    gap: 6px;
  }

  .play-score {
    font-size: 22px;
  }

  .play-score-bar {
    width: 12px;
  }

  .hint {
    text-align: center;
  }
}