body{
  min-height: 100vh;
  margin: 0;
  font-family: 'Montserrat', Arial, sans-serif;
  color: #222;
  position: relative;
  overflow-x: hidden;
}
.bg-gradient {
  position: fixed;
  inset: 0;
  z-index: 0;
  background: radial-gradient(circle at 30% 30%, #f08c7d40 0%, #f5f7fa 70%);
  background-size: cover;
  filter: blur(2px);
  width: 100vw;
  height: 100vh;
}
.game-card {
  position: relative;
  z-index: 2;
  background: rgba(255,255,255,0.65);
  border-radius: 28px;
  box-shadow: 0 8px 32px #f08c7d22, 0 2px 12px #00000010;
  padding: 36px 24px 28px 24px;
  width: 410px;
  max-width: 98vw;
  margin: 48px auto 24px auto;
  backdrop-filter: blur(8px);
  border: 1.5px solid #f08c7d33;
  box-sizing: border-box;
  text-align: center;
  transition: box-shadow 0.2s;
}
h1 {
  margin-top: 0;
  margin-bottom: 18px;
  font-size: 2em;
  font-weight: 700;
  color: #38414b;
  letter-spacing: 1px;
  text-shadow: 0 2px 0 #fff, 0 4px 12px #f08c7d22;
}
.mode-select {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 16px;
}
.mode-select button {
  background: #f5f7fa;
  border: none;
  border-radius: 10px;
  padding: 9px 22px;
  font-size: 1em;
  cursor: pointer;
  font-weight: 600;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
  box-shadow: 0 2px 8px #f08c7d09;
}
.mode-select button.active, .mode-select button:hover {
  background: linear-gradient(90deg, #f08c7d 60%, #f5a623 100%);
  color: #fff;
  box-shadow: 0 4px 16px #f08c7d22;
}
.status {
  min-height: 28px;
  font-size: 1.13em;
  color: #38414b;
  margin-bottom: 14px;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-shadow: 0 1px 0 #fff;
}
.board {
  display: grid;
  grid-template-columns: repeat(3, 90px);
  grid-template-rows: repeat(3, 90px);
  gap: 16px;
  justify-content: center;
  margin-bottom: 18px;
  position: relative;
  z-index: 2;
}
.cell {
  width: 90px;
  height: 90px;
  background: rgba(255,255,255,0.75);
  border-radius: 16px;
  box-shadow: 0 2px 12px #f08c7d11, 0 1px 4px #0001;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  user-select: none;
  font-size: 0;
  position: relative;
  transition: background 0.15s, transform 0.1s;
  border: 2.5px solid #f08c7d33;
  overflow: hidden;
}
.cell:not(.x):not(.o):hover:not(.disabled) {
  background: #fbeee6;
  transform: scale(1.06);
  box-shadow: 0 4px 20px #f08c7d33;
}
.cell.x, .cell.o {
  cursor: default;
  background: #fff;
  animation: pop 0.18s;
}
.cell.x svg, .cell.o svg {
  width: 54px;
  height: 54px;
  display: block;
}
.cell.x svg {
  stroke: #38414b;
  stroke-width: 8;
  stroke-linecap: round;
  filter: drop-shadow(2px 4px 2px #38414b22);
}
.cell.o svg {
  stroke: #f08c7d;
  stroke-width: 8;
  filter: drop-shadow(2px 4px 2px #f08c7d33);
}
.cell.disabled {
  cursor: default;
  opacity: 0.8;
}
@keyframes pop {
  0% { transform: scale(1.22); }
  100% { transform: scale(1); }
}
#winLine {
  position: absolute;
  left: 0; top: 0;
  pointer-events: none;
  z-index: 3;
}
.reset-btn {
  padding: 11px 34px;
  font-size: 1em;
  background: linear-gradient(90deg, #38414b 60%, #f08c7d 100%);
  color: #fff;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  margin-top: 10px;
  letter-spacing: 0.1em;
  transition: background 0.2s, box-shadow 0.2s;
  font-weight: 600;
  box-shadow: 0 2px 8px #f08c7d11;
}
.reset-btn:hover {
  background: linear-gradient(90deg, #f08c7d 60%, #38414b 100%);
  color: #fff;
  box-shadow: 0 4px 16px #f08c7d33;
}
footer {
  text-align: center;
  color: #888;
  font-size: 0.97em;
  margin-bottom: 10px;
  z-index: 1;
  position: relative;
}
@media (max-width: 600px) {
  .game-card {
    padding: 10px 2vw;
    width: 99vw;
  }
  .board {
    grid-template-columns: repeat(3, 60px);
    grid-template-rows: repeat(3, 60px);
    gap: 8px;
  }
  .cell {
    width: 60px;
    height: 60px;
    border-radius: 10px;
  }
  .cell.x svg, .cell.o svg {
    width: 32px;
    height: 32px;
  }
}