:root {
  --font: "Be Vietnam Pro", Arial, sans-serif;
  --title: "Baloo 2", "Be Vietnam Pro", sans-serif;
  --ink: #3b2a1a;
  --brown: #8a4b14;
  --muted: #9a7a55;
  /* sân chơi tỉ lệ 7:8, vừa cả chiều ngang lẫn chiều cao màn hình */
  --w: min(560px, 94vw, max(250px, calc((100vh - 195px) * 0.875)));
}
* {
  box-sizing: border-box;
}
[hidden] {
  display: none !important;
}
html,
body {
  margin: 0;
}
body {
  min-height: 100vh;
  overflow-x: hidden;
  background: linear-gradient(#ffe9c7, #fff6e6 45%, #f3fbe6);
  color: var(--ink);
  font-family: var(--font);
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}
button {
  font-family: var(--font);
  color: inherit;
  cursor: pointer;
}
kbd {
  padding: 0 5px;
  border: 1px solid #d8c4a2;
  border-radius: 4px;
  background: #fffdf6;
  font: 700 11px var(--font);
}
.back {
  position: fixed;
  top: 12px;
  left: 14px;
  z-index: 5;
  color: var(--brown);
  font-weight: 700;
  font-size: 13px;
  text-decoration: none;
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 10px 8px 14px;
}
.stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}
.stat {
  position: relative;
  min-width: 84px;
  padding: 5px 12px 3px;
  border-radius: 14px;
  background: #fffdf6;
  box-shadow:
    0 3px 0 #ecd6b0,
    0 6px 14px rgba(80, 50, 20, 0.12);
  text-align: center;
}
.stat small {
  display: block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.stat b {
  display: block;
  font: 800 26px/1.15 var(--title);
}
#stScore {
  color: #e8590c;
}
#stCombo {
  color: #ae3ec9;
}
#stBest {
  color: #2b8a3e;
}
.stat b.lives {
  min-width: 60px;
  color: #f03e3e;
  font-size: 20px;
  line-height: 1.6;
  letter-spacing: 1px;
}
.lives s {
  color: rgba(0, 0, 0, 0.13);
  text-decoration: none;
}
.mult {
  position: absolute;
  top: -9px;
  right: -9px;
  padding: 0 7px;
  border-radius: 10px;
  background: #ae3ec9;
  color: #fff;
  font: 700 12px/20px var(--font);
  font-style: normal;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.field-wrap {
  width: var(--w);
  height: calc(var(--w) * 8 / 7);
  border-radius: 22px;
  overflow: hidden;
  box-shadow:
    0 0 0 4px #fffdf6,
    0 12px 30px rgba(90, 60, 20, 0.25);
}
canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
}

.tools {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}
.tool {
  height: 40px;
  padding: 0 16px;
  border: 0;
  border-radius: 12px;
  background: #fffdf6;
  box-shadow: 0 3px 0 #ecd6b0;
  font-weight: 700;
  font-size: 14px;
  color: #7a5a35;
}
.tool:active {
  transform: translateY(2px);
  box-shadow: 0 1px 0 #ecd6b0;
}
.keys {
  margin: 0;
  font-size: 12px;
  color: #7a6a55;
  text-align: center;
}
@media (hover: none) {
  .keys {
    display: none;
  }
}

/* ---------- Hộp thoại ---------- */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 16px;
  background: rgba(60, 35, 10, 0.35);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.card {
  width: min(450px, 100%);
  max-height: calc(100vh - 32px);
  overflow: auto;
  padding: 18px 22px;
  border-radius: 22px;
  background: #fffdf6;
  box-shadow:
    0 6px 0 #ecd6b0,
    0 20px 50px rgba(0, 0, 0, 0.3);
  text-align: center;
  animation: cardIn 0.3s cubic-bezier(0.3, 1.5, 0.5, 1);
}
@keyframes cardIn {
  from {
    transform: scale(0.85);
    opacity: 0;
  }
}
.ico {
  font-size: 42px;
  line-height: 1;
}
.card h2 {
  margin: 4px 0 10px;
  font: 800 30px/1.1 var(--title);
  color: var(--brown);
}
.card p {
  margin: 0 0 14px;
  color: #6b5a45;
  line-height: 1.55;
}
.seg {
  display: flex;
  gap: 4px;
  margin-bottom: 12px;
  padding: 4px;
  border-radius: 14px;
  background: #f4e6cc;
}
.seg button {
  flex: 1;
  padding: 6px 4px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  font-weight: 800;
  font-size: 15px;
  color: #7a5a35;
}
.seg button small {
  display: block;
  font-size: 11px;
  font-weight: 600;
  opacity: 0.8;
}
.seg button.on {
  background: #fff;
  color: #e8590c;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.12);
}
.legend {
  margin: 0 0 10px;
  padding: 0;
  list-style: none;
  text-align: left;
}
.legend li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 6px;
  border-bottom: 1px dashed #ecdcc0;
  font-size: 13.5px;
}
.legend li > span {
  flex: none;
  width: 58px;
  font-size: 18px;
  text-align: center;
  white-space: nowrap;
}
.legend li b {
  margin-left: auto;
  color: #2b8a3e;
  white-space: nowrap;
}
.legend li b.bad {
  color: #e03131;
}
.card p.tip {
  font-size: 12.5px;
}
.btns {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}
.btn {
  min-width: 110px;
  height: 46px;
  padding: 0 18px;
  border: 0;
  border-radius: 14px;
  background: #f4e6cc;
  box-shadow: 0 3px 0 #dcc6a0;
  font-weight: 800;
  font-size: 16px;
  color: #7a5a35;
}
.btn.primary {
  background: linear-gradient(#ffa94d, #f76707);
  box-shadow: 0 3px 0 #c2410c;
  color: #fff;
}
.btn:active {
  transform: translateY(2px);
  box-shadow: none;
}
.final {
  font: 800 60px/1 var(--title);
  color: #e8590c;
}
.final-sub {
  margin-top: 2px;
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
}
.results {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 12px 0 16px;
}
.results div {
  padding: 7px 6px;
  border-radius: 12px;
  background: #f8efdd;
}
.results small {
  display: block;
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
}
.results b {
  font: 800 22px/1.2 var(--title);
}

@media (max-width: 520px) {
  .back {
    position: static;
    align-self: flex-start;
  }
  .stats {
    gap: 6px;
  }
  .stat {
    min-width: 0;
    padding: 4px 9px 2px;
  }
  .stat small {
    font-size: 9px;
  }
  .stat b {
    font-size: 21px;
  }
  .stat b.lives {
    font-size: 16px;
  }
}