:root {
  --bg: #1e293b;
  --panel: #0f172a;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --correct: #4ade80;
  --wrong: #f87171;
  --key: #334155;
  --key-hover: #475569;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.game {
  width: 100%;
  max-width: 520px;
  margin: 2rem 1rem;
  padding: 1.5rem;
  background: var(--panel);
  border-radius: 16px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
  text-align: center;
}

/* Logo image at the bottom of the game — links back to the launcher */
.home-btn {
  display: block;
  margin: 1.5rem auto 0;
  max-width: 220px;
  border-radius: 10px;
  overflow: hidden;
  opacity: 0.8;
  transition: opacity 0.15s, transform 0.12s;
}
.home-btn img {
  display: block;
  width: 100%;
}
.home-btn:hover {
  opacity: 1;
  transform: scale(1.04);
}

h1 {
  margin: 0 0 1rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
}

.score {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  margin-bottom: 1rem;
  padding: 0.6rem 1rem;
  background: var(--bg);
  border-radius: 12px;
}
.score-side {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 5rem;
  position: relative;
}
.score-label {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.name-btn {
  max-width: 7rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: inherit;
  font-weight: 600;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  border-bottom: 1px dashed var(--muted);
}
.name-btn:hover { color: var(--accent); border-bottom-color: var(--accent); }
.name-input {
  width: 7rem;
  font-family: inherit;
  font-size: 0.8rem;
  text-align: center;
  color: var(--text);
  background: var(--key);
  border: 1px solid var(--accent);
  border-radius: 6px;
  padding: 0.1rem 0.3rem;
}
.name-input:focus { outline: none; }
.name-list {
  position: absolute;
  top: 1.6rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  min-width: 7rem;
  max-height: 9rem;
  overflow-y: auto;
  margin: 0;
  padding: 0.2rem;
  list-style: none;
  text-align: left;
  background: var(--panel);
  border: 1px solid var(--key-hover);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}
.name-list li {
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  font-size: 0.9rem;
  cursor: pointer;
}
.name-list li:hover { background: var(--key); color: var(--accent); }
.name-list li.name-add-hint { color: var(--muted); font-style: italic; }
.name-list li.name-add-hint:hover { color: var(--accent); }
.score-num {
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1.1;
}
.score-side:first-child .score-num { color: var(--correct); }
.score-side:last-child  .score-num { color: var(--wrong); }
.score-vs {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--muted);
}

.status {
  min-height: 1.5rem;
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0.5rem 0 1rem;
}
.status.won  { color: var(--correct); }
.status.lost { color: var(--wrong); }

/* Board: 3 columns/rows, cells sized responsively for phone and desktop. */
.ttt-board {
  display: grid;
  grid-template-columns: repeat(3, clamp(5.5rem, 26vw, 8rem));
  grid-template-rows: repeat(3, clamp(5.5rem, 26vw, 8rem));
  gap: 0.65rem;
  margin: 0 auto 1.5rem;
  width: fit-content;
}

.ttt-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(3rem, 13vw, 4.8rem);
  font-weight: 900;
  line-height: 1;
  user-select: none;
  /* Raised face: gradient top surface + hard bottom edge + drop shadow */
  background: linear-gradient(160deg, #3b5068 0%, #273848 100%);
  border: none;
  border-radius: 14px;
  cursor: pointer;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.09),
    0 5px 0 #101926,
    0 8px 18px rgba(0, 0, 0, 0.5);
  transition: box-shadow 0.08s ease, transform 0.08s ease, background 0.1s;
  color: var(--text);
}

/* Hover: lift lifts slightly (but don't press — reserved for click) */
.ttt-cell:hover:not(:disabled):not(.taken) {
  background: linear-gradient(160deg, #455e77 0%, #304355 100%);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.09),
    0 7px 0 #101926,
    0 12px 20px rgba(0, 0, 0, 0.55);
  transform: translateY(-2px);
}

.ttt-cell:disabled { cursor: default; }

/* X — green with layered depth shadow */
.ttt-cell.x {
  color: #4ade80;
  text-shadow:
    0 2px 0 #166534,
    0 4px 0 #0d3d1e,
    0 5px 10px rgba(0, 0, 0, 0.55);
}

/* O — larger letter, thinner stroke (weight 400 vs X's 900), red/coral */
.ttt-cell.o {
  font-size: clamp(4rem, 18vw, 6.5rem);
  font-weight: 400;
  color: #fb8080;
  text-shadow:
    0 2px 0 #9b1c1c,
    0 4px 0 #7f1d1d,
    0 6px 12px rgba(0, 0, 0, 0.6);
}

/* Winning cells: blue tint face */
.ttt-cell.win {
  background: linear-gradient(160deg, #1e4566 0%, #14324e 100%);
  box-shadow:
    inset 0 1px 0 rgba(56, 189, 248, 0.25),
    0 5px 0 #091422,
    0 8px 18px rgba(0, 0, 0, 0.5);
}

.new-game {
  padding: 0.7rem 1.6rem;
  font-size: 1rem;
  font-weight: 700;
  color: #06351a;
  background: var(--accent);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: filter 0.15s;
}
.new-game:hover { filter: brightness(1.1); }

.level-btns {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  margin: 0.6rem 0 0;
}
.level-btn {
  padding: 0.3rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--muted);
  background: var(--key);
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.level-btn:hover { color: var(--text); }
.level-btn.active { color: var(--accent); border-color: var(--accent); }