/* ====== GAME-SPECIFIC VARIABLES ====== */
:root {
  --n: 4;
  --size: 40px;
  --gap: 0px;
  --tile-empty: #fff;
  --line-color: var(--text-primary);
  --line-preview: #c0c0c0;
  --line-hover: var(--accent);
  --error-color: #ff4444;
}

/* ====== GAME LAYOUT ====== */
#app {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  margin-top: 26px;
  padding: 0 10px;
}

@media (max-width: 600px) {
  #app {
    margin-top: 16px;
    padding: 0 5px;
  }
}

.gameWrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.boardArea {
  position: relative;
  background: #fff;
  border: 2px solid var(--border-color);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  padding: 16px;
  transition: all 0.3s ease;
}

@media (max-width: 600px) {
  .boardArea {
    padding: 10px;
  }
}

.boardArea.solved {
  border-color: var(--accent);
  box-shadow: 0 2px 12px rgba(108, 99, 255, 0.3);
}

#gameGrid {
  display: grid;
  grid-template-columns: repeat(var(--n), var(--size));
  grid-template-rows: repeat(var(--n), var(--size));
  gap: var(--gap);
  position: relative;
}

/* ====== CELLS ====== */
.cell {
  width: var(--size);
  height: var(--size);
  border: 1px solid var(--border-light);
  background: var(--tile-empty);
  position: relative;
  cursor: pointer;
}

/* ====== CIRCLES ====== */
.circle {
  position: absolute;
  width: calc(var(--size) * 0.4);
  height: calc(var(--size) * 0.4);
  min-width: 12px;
  min-height: 12px;
  max-width: 24px;
  max-height: 24px;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 15;
  transition: all 0.2s ease;
}

.circle.white {
  border: min(3px, calc(var(--size) * 0.075)) solid var(--text-primary);
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.circle.black {
  background: var(--text-primary);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.circle.error.white {
  border-color: var(--error-color);
  box-shadow: 0 0 8px rgba(255, 68, 68, 0.5);
}

.circle.error.black {
  background: var(--error-color);
  box-shadow: 0 0 8px rgba(255, 68, 68, 0.5);
}

/* ====== LINES ====== */
.line {
  position: absolute;
  background: var(--line-color);
  pointer-events: none;
  z-index: 5;
  transition: opacity 0.1s;
  --line-thickness: max(3px, min(5px, calc(var(--size) * 0.1)));
}

.line.preview {
  background: var(--line-preview);
  z-index: 4;
}

.line.hover {
  background: var(--line-hover);
  z-index: 6;
  opacity: 0.5;
}

/* Horizontal lines - extend equally left and right */
.line.horizontal {
  height: var(--line-thickness);
  top: 50%;
  transform: translateY(-50%);
  left: calc(var(--line-thickness) * -0.5);
  width: calc(100% + var(--line-thickness));
}

/* Vertical lines - extend equally top and bottom */
.line.vertical {
  width: var(--line-thickness);
  left: 50%;
  transform: translateX(-50%);
  top: calc(var(--line-thickness) * -0.5);
  height: calc(100% + var(--line-thickness));
}

/* ====== EDGE HOVER AREAS ====== */
.edge {
  position: absolute;
  cursor: pointer;
  z-index: 20;
}

.edge.horizontal {
  height: min(20px, calc(var(--size) * 0.5));
  width: calc(var(--size) + 2px);
  top: 50%;
  transform: translateY(-50%);
}

.edge.vertical {
  width: min(20px, calc(var(--size) * 0.5));
  height: calc(var(--size) + 2px);
  left: 50%;
  transform: translateX(-50%);
}

.edge:hover {
  background: rgba(108, 99, 255, 0.1);
}

/* ====== CODE INPUT SPECIFIC ====== */
.codeInputWrap {
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
}

.codeInputWrap input {
  flex: 1;
  padding: 8px 10px;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-family: monospace;
}

.codeButtons {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

#copyCodeBtn.copied {
  background: var(--accent);
  color: #fff;
}

/* ====== HELP MODAL ====== */
.helpModal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 200;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(3px);
  background: rgba(0, 0, 0, 0.45);
}

.helpBox {
  max-width: 480px;
  background: #fff;
  padding: 30px 28px;
  border-radius: 14px;
  box-shadow: var(--shadow-lg);
  max-height: 90vh;
  overflow-y: auto;
}

.helpBox h2 {
  margin-bottom: 20px;
  font-size: 1.4rem;
}

.helpBox p {
  margin-bottom: 16px;
  font-size: 0.95rem;
  line-height: 1.5;
}

/* ====== TUTORIAL EXAMPLES ====== */
.examples {
  margin: 24px 0;
}

.example-group {
  margin-bottom: 28px;
}

.example-group h3 {
  font-size: 1.1rem;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.example-row {
  display: flex;
  gap: 20px;
  justify-content: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.example {
  text-align: center;
  flex: 0 0 auto;
}

.example svg {
  background: var(--bg);
  border-radius: 8px;
  border: 2px solid var(--border-color);
  margin-bottom: 8px;
  box-shadow: var(--shadow-sm);
}

.example-label {
  font-size: 0.85rem;
  color: #666;
}

.example-label.correct {
  color: #4a9d4a;
  font-weight: 600;
}

.example-label.incorrect {
  color: #d63638;
  font-weight: 600;
}

@media (max-width: 480px) {
  .example-row {
    gap: 12px;
  }
  
  .example svg {
    width: 90px;
    height: 90px;
  }
}