/* --- CSS Variables --- */
:root {
  /* Base colors */
  --color-light: #ffffff;
  --color-dark: #000000;
  --color-gray: #808080;
  --color-light-gray: #d3d3d3;
  --color-red: #ff0000;

  /* Shadow colors */
  --shadow-light: rgba(255, 255, 255, 0.5);
  --shadow-dark: rgba(0, 0, 0, 0.3);
  --accent: #ff6b35;
  --hover: #ff8c61;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  margin: 0; /* Ensure no default margin */
  transition: background-color 0.3s ease; /* Smooth transition for theme changes */

  /* Default Theme (Light) */
  --bg-color: var(--color-light);
  --text-color: var(--color-dark);
  --border-color: var(--color-gray);
  --icon-color: var(--color-dark);
  --shadow-color: var(--shadow-dark);
  --cell-hover-bg: var(--color-light-gray);
  --cross-color: #3a0ca3; /* A nice purple */
  --circle-color: #f72585; /* A vibrant pink */
  background-color: var(--bg-color);
}

.page-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: 1rem;
}

.game-header {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  padding: 1rem;
  flex-wrap: wrap;
  position: relative;
  min-height: 80px; /* Give header some space */
}

.player-choice-button {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  background: none;
  border: 2px solid transparent;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.2s, border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  -webkit-tap-highlight-color: transparent;
  color: var(--text-color);
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: 0 2px 4px var(--shadow-color);
}

.player-choice-button:hover, .player-choice-button:focus-visible {
  background-color: var(--cell-hover-bg);
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 8px var(--shadow-color);
}

.player-choice-button img {
  width: 48px;
  height: 48px;
}

.main {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  width: min(75vh, 90vw);
  height: min(75vh, 90vw);
  margin: 2vh auto; /* Reduced margin as header/footer add space */
  position: relative; /* Needed for positioning the winning line SVG */
}

.cell {
  background-color: transparent; /* Let body background show through */
}

.theme-switcher { /* Now styled as a button */
  cursor: pointer;
  background: none;
  border: none;
  padding: 0.25rem; /* Add padding for a better click area */
  -webkit-tap-highlight-color: transparent; /* This is a good property */
  transition: transform 0.2s;
  font-size: 1.8rem; /* Make icon larger */
  color: var(--icon-color);
}

div.about a {
  color: var(--icon-color);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  transition: background-color 0.2s;
}

div.about a:hover {
  background-color: var(--cell-hover-bg);
}

.player-choice-button:hover, .player-choice-button:focus-visible {
  background-color: var(--cell-hover-bg);
  border-color: var(--accent);
}

.turn-info {
  display: flex;
  flex-direction: column-reverse; /* Stack items vertically, with button on top */
  align-items: center;
  gap: 0.5rem; /* Add some space between the button and the text */
}

#turn-indicator {
  color: var(--text-color); /* Use CSS variable */
  text-shadow: 1px 1px 3px var(--shadow-color); /* Use CSS variable */
  margin: 0; /* Remove default margin from h2 */
  font-size: 1.2rem; /* Make it a bit larger for better visibility */
  font-weight: 600; /* Make it bold */
}

.new-game-button {
  padding: 0.7rem 1.4rem;
  background: var(--accent);
  color: var(--color-light);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
  transition: background 0.2s, opacity 0.3s, visibility 0.3s;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  opacity: 0; /* Hidden by default, shown when game ends */
  visibility: hidden;
}

.new-game-button.show {
  opacity: 1;
  visibility: visible;
}

.player-button {
  display: flex;
  justify-content: center;
  align-items: center;
  background: none;
  border: none;
  padding: 0.5rem;
  border-radius: 50%;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.2s;
  -webkit-tap-highlight-color: transparent;
}

.player-button:hover {
  background-color: var(--cell-hover-bg);
  transform: scale(1.1);
}

.player-button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.computer,
.human {
  filter: drop-shadow(0 1px 2px var(--shadow-color));
}

/* --- Themes --- */

.evening, .midnight {
  --bg-color: #301860;
  --text-color: var(--color-light);
  --border-color: var(--color-light-gray);
  --icon-color: var(--color-light);
  --shadow-color: var(--shadow-light);
  --cell-hover-bg: #4a2a8a;
  --cross-color: #72ddf7; /* Light Blue */
  --circle-color: #f7b801; /* Yellow */
}

.evening .player-choice-button img,
.midnight .player-choice-button img {
  filter: invert(1) drop-shadow(0 1px 2px var(--shadow-color));
}

.midnight {
  --bg-color: var(--color-dark);
  --cell-hover-bg: #333;
}

.afternoon {
  --bg-color: #FFD700;
}

.morning {
  --bg-color: #FF7E00;
}

.cell {
  border-right: 2px solid var(--border-color);
  border-bottom: 2px solid var(--border-color);
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Remove borders from the last column and last row */
.cell:nth-child(3n) { /* Every 3rd cell (3, 6, 9) */
  border-right: 0;
}
.cell:nth-child(n+7) { /* Cells 7, 8, 9 */
  border-bottom: 0;
}

.cell:hover {
  cursor: pointer;
  background-color: var(--cell-hover-bg);
}

.cell svg.cross {
  color: var(--cross-color);
}

.cell svg.circle {
  color: var(--circle-color);
}

#winning-line {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none; /* Allows clicks to pass through to the cells below */
}

#winning-line line {
  stroke: var(--color-red);
  stroke-width: 10;
  stroke-linecap: round;
  animation: drawLine 0.5s ease-out forwards;
  stroke-dasharray: 1000;
  stroke-dashoffset: 1000;
}

/* --- Animations --- */
.theme-switcher:active {
  transform: scale(0.9) rotate(15deg);
}

.cell svg {
  animation: fadeIn 0.3s ease-in-out;
}

@keyframes drawLine {
  to {
    stroke-dashoffset: 0;
  }
}

.game-over .cell {
  opacity: 0.5;
  transition: opacity 0.5s ease-in-out;
}

/* When game is over, don't dim the winning cells */
.game-over .cell.winning-cell {
  opacity: 1;
}

@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.5); }
  50%  { transform: scale(1.1); }
  to   { opacity: 1; transform: scale(1); }
}

.theme-switcher.rotating {
  transition: transform 0.3s ease-in-out;
  transform: rotate(360deg);
}