:root {
  --bg-color: #f9f5fb;
  --text-color: #4b0082;
  --field-border-color: #4b0082;
  --cross-color: #4b0082;
  --circle-color: #4b0082;
  --btn-bg-color: rgb(213, 117, 237);
  --btn-text-color: white;
  --btn-hover-bg-color: rgb(180, 80, 210);
  --highlight-color: rgba(75, 0, 130, 0.6);  
}

body.bw {
  --bg-color: #fff;
  --text-color: #000;
  --field-border-color: #000;
  --cross-color: #000;
  --circle-color: #000;
  --btn-bg-color: #000;
  --btn-text-color: #fff;
  --btn-hover-bg-color: #222;
  --highlight-color: rgba(0, 0, 0, 0.3);  
}

body.blue {
  --bg-color: #e6f0ff;
  --text-color: #003366;
  --field-border-color: #003366;
  --cross-color: #003366;
  --circle-color: #003366;
  --btn-bg-color: #3366cc;
  --btn-text-color: white;
  --btn-hover-bg-color: #254a99;
  --highlight-color: rgba(0, 51, 102, 0.4);  
}

body.yellow {
  --bg-color: #fff9e6;
  --text-color: #665500;
  --field-border-color: #665500;
  --cross-color: #665500;
  --circle-color: #665500;
  --btn-bg-color: #ffcc00;
  --btn-text-color: #333300;
  --btn-hover-bg-color: #cca300;
  --highlight-color: rgba(102, 85, 0, 0.4);  
}

body.red {
  --bg-color: #ffe6e6;
  --text-color: #660000;
  --field-border-color: #660000;
  --cross-color: #660000;
  --circle-color: #660000;
  --btn-bg-color: #cc0000;
  --btn-text-color: white;
  --btn-hover-bg-color: #990000;
  --highlight-color: rgba(102, 0, 0, 0.4);  
}

body.rainbow {
  background: linear-gradient(135deg, #ff0057, #ffdd00, #00ff7f, #00bfff, #bf00ff);
  --bg-color: transparent;
  --text-color: rgb(13, 13, 13);
  --field-border-color: rgb(235, 100, 123);
  --cross-color: rgb(22, 71, 206);
  --circle-color: rgb(188, 16, 119);
  --btn-bg-color: rgba(255, 255, 255, 0.3);
  --btn-text-color: rgb(13, 13, 13);
  --btn-hover-bg-color: rgba(255, 255, 255, 0.5);
  --highlight-color: rgba(255, 255, 255, 0.4); 
}
body.rainbow .dialog-settings,
body.rainbow .dialog-rules {
  background: linear-gradient(135deg, #ff0057, #ffdd00, #00ff7f, #00bfff, #bf00ff);
  color: black;
}
body.rainbow::before {
  content: "";
  position: fixed;
  inset: 0;
  background: linear-gradient(135deg, #ff0057, #ffdd00, #00ff7f, #00bfff, #bf00ff);
  filter: blur(15px);
  z-index: -1;
  pointer-events: none;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  margin: 0;
  font-family: Arial, sans-serif;
}


.game-header-container {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  margin-bottom: 15px;
}

.game-header {
  font-size: 3rem;
  text-align: center;
  flex-grow: 1;
  margin: 0 10px;
}

.corner-btn {
  background-color: var(--btn-bg-color);
  color: var(--btn-text-color);
  border: none;
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 1.5rem;
  cursor: pointer;
  user-select: none;
  box-shadow: 0 2px 5px rgba(0,0,0,0.2);
  transition: background-color 0.3s ease;
  flex-shrink: 0;
}

.corner-btn:hover {
  background-color: var(--btn-hover-bg-color);
}

.game-field {
  border-collapse: collapse;
  width: 90vw;
  max-width: 500px;
  aspect-ratio: 1 / 1;
  table-layout: fixed;
  margin-bottom: 20px;
  border: 5px solid var(--field-border-color);
}

.game-field td {
  border: 5px solid var(--field-border-color);
  width: 33.33%;
  height: 0;
  padding-bottom: 33.33%;
  position: relative;
  overflow: hidden;
  vertical-align: middle;
  text-align: center;
}

.result-text {
  margin: 0;
}

.cross::before,
.cross::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 10%;
  height: 100%;
  background-color: var(--cross-color);
  transform-origin: center;
}

.cross::before {
  transform: translate(-50%, -50%) rotate(45deg);
}

.cross::after {
  transform: translate(-50%, -50%) rotate(-45deg);
}

.cross, .circle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 65%;
  height: 65%;
}

.circle {
  border: 6px solid var(--circle-color);
  border-radius: 50%;
  box-sizing: border-box;
}

.main-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  padding: 10px;
}

.start-btn {
  background-color: var(--btn-bg-color);
  color: var(--btn-text-color);
  font-size: 2vw;
  border-radius: 10%;
  padding: 10px 20px;
  cursor: pointer;
  max-width: 300px;
  width: 80vw;
  transition: background-color 0.3s ease;
}

.start-btn:hover {
  background-color: var(--btn-hover-bg-color);
}


dialog:not([open]) {
  display: none;
}

dialog {
  position: relative;
  padding: 20px 30px 30px 30px;
  border-radius: 10px;
  border: 2px solid var(--field-border-color);
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  max-width: 350px;
  width: 90vw;
  background-color: var(--bg-color);
  color: var(--text-color);
  display: flex;
  flex-direction: column;
  gap: 15px;
}


.dialog-rules, .dialog-settings {
  padding-top: 40px;  
}

.close-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: transparent;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--text-color);
  padding: 0;
  line-height: 1;
  user-select: none;
  transition: color 0.2s ease;
}

.close-btn:hover {
  color: var(--btn-bg-color);
}

.dialog-settings {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.dialog-settings label,
.dialog-settings select {
  width: 100%;
  font-size: 1rem;
}

.dialog-settings select {
  padding: 6px 10px;
  border-radius: 5px;
  border: 1px solid var(--field-border-color);
  background-color: var(--bg-color);
  color: var(--text-color);
  cursor: pointer;
  appearance: none;
}

.dialog-settings label {
  font-weight: bold;
}

@keyframes highlightFlash {
  0%, 100% {
    background-color: transparent;
  }
  50% {
    background-color: var(--highlight-color);
  }
}

td {
  position: relative;  
}

.highlight {
  border: none; 
  background-color: transparent;
  border-radius: 8px;  
}

.highlight::before {
  content: "";
  position: absolute;
  inset: 0;  
  border-radius: 8px;
  animation: highlightFlash 1s ease-in-out infinite;
  border: 3px solid var(--highlight-color);
  background-color: transparent;
  pointer-events: none;
  z-index: 1;
}

@media (max-width: 400px) {
  body.rainbow {
    background: transparent;
  }
  dialog {
    max-width: 90vw;
    width: 90vw;
    padding: 15px 20px;
    font-size: 0.85rem;
    box-sizing: border-box;
  }
  dialog * {
    font-size: 0.85rem;
    word-wrap: break-word;
  }

  .close-btn,
  .corner-btn {
    font-size: 1.2rem;
    padding: 6px 10px;
    border-radius: 6px;
  }

  .game-header {
    font-size: 5vw; 
    margin: 0 5px;
  }

  .start-btn {
    font-size: 4vw;
    padding: 8px 15px;
    max-width: 100%;
    width: 90vw;
  }

  .game-field {
    width: 90vw;
    max-width: none;
    border-width: 3px;
  }

  .game-field td {
    border-width: 3px;
    padding-bottom: 33.33%;
  }
}

