* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #548687;
  --cell: #ffffc7;
  --o: #b0413e;
  --x: #1d3f40;
  --dark: #191913;
  --board: min(92vw, 58dvh, 460px);
}

body {
  background-color: var(--bg);
  color: var(--cell);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  text-align: center;
  min-height: 100dvh;
}

main {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: clamp(0.6rem, 2dvh, 1.2rem);
  padding: 1rem;
}

h1 {
  font-size: clamp(1.8rem, 6vw, 2.8rem);
}

.mode select {
  font: inherit;
  padding: 0.4rem 0.6rem;
  border-radius: 0.6rem;
  border: none;
  background: var(--cell);
  color: var(--dark);
  margin-left: 0.4rem;
}

.scores {
  display: flex;
  gap: 0.6rem;
}

.scores div {
  min-width: 5.5rem;
  padding: 0.4rem 0.8rem;
  border-radius: 0.8rem;
  background: rgba(0, 0, 0, 0.2);
  transition: background 0.2s;
}

.scores div.turn {
  background: rgba(0, 0, 0, 0.45);
  outline: 2px solid var(--cell);
}

.scores span {
  display: block;
  font-size: 0.85rem;
}

.scores b {
  font-size: 1.5rem;
}

#status {
  font-size: 1.2rem;
  min-height: 1.6em;
}

.container {
  display: flex;
  justify-content: center;
  align-items: center;
}

.game {
  width: var(--board);
  height: var(--board);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: calc(var(--board) * 0.025);
}

.box {
  border-radius: 1rem;
  border: none;
  box-shadow: 0 0 1rem rgba(0, 0, 0, 0.3);
  font-size: calc(var(--board) * 0.22);
  font-weight: 700;
  line-height: 1;
  background-color: var(--cell);
  cursor: pointer;
  transition: transform 0.12s, background-color 0.2s;
}

.box:hover:not(:disabled) {
  transform: scale(1.04);
}

.box:disabled {
  cursor: default;
}

.box.o { color: var(--o); }
.box.x { color: var(--x); }

.box.win {
  background-color: #fff;
  box-shadow: 0 0 0 4px var(--dark), 0 0 1.5rem rgba(0, 0, 0, 0.4);
}

.actions {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  justify-content: center;
}

#reset-btn,
#again-btn,
#new-btn {
  padding: 0.8rem 1.4rem;
  font-size: 1.1rem;
  background-color: var(--dark);
  color: #fff;
  border-radius: 1rem;
  border: none;
  cursor: pointer;
}

#reset-btn:hover,
#again-btn:hover,
#new-btn:hover {
  background-color: var(--o);
}

:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 2px;
}

.msg-container {
  position: fixed;
  inset: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(25, 25, 19, 0.65);
  z-index: 10;
}

.msg-card {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: center;
  padding: 2rem;
  margin: 1rem;
  border-radius: 1.2rem;
  background: var(--bg);
  box-shadow: 0 0 2rem rgba(0, 0, 0, 0.5);
}

#msg {
  color: var(--cell);
  font-size: clamp(1.4rem, 5vw, 2rem);
}

.hide {
  display: none;
}

@media (max-height: 560px) and (orientation: landscape) {
  :root { --board: min(60vw, 62dvh); }
  main { flex-direction: row; flex-wrap: wrap; align-content: center; }
  h1, .mode, .scores, #status, .actions { flex-basis: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  .box, .scores div { transition: none; }
}