* { 
  box-sizing: border-box; 
  margin: 0; 
  padding: 0; 
}

:root {
  --bg-color: #0d1117;
  --panel-bg: #161b22;
  --border-color: #30363d;
  --text-main: #c9d1d9;
  --text-muted: #8b949e;
  --accent-pink: #ff7b72;
  --accent-green: #3fb950;
  --accent-blue: #58a6ff;
  --cell-hidden: #0d1117;
  --cell-hover: #21262d;
  --cell-visited: #161b22;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg-color);
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 24px;
  min-height: 100vh;
}

h1 { 
  color: var(--accent-pink); 
  font-size: 2rem; 
  letter-spacing: 4px; 
  margin-bottom: 4px; 
  text-transform: uppercase;
}

.sub { 
  color: var(--text-muted); 
  font-size: 0.9rem; 
  margin-bottom: 24px; 
  letter-spacing: 1px; 
}

.clue-box {
  background: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px 24px;
  margin-bottom: 24px;
  font-size: 0.95rem;
  text-align: center;
  min-height: 60px;
  max-width: 450px;
  line-height: 1.6;
  color: var(--text-main);
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
}

#grid {
  display: grid;
  grid-template-columns: repeat(6, 70px);
  gap: 4px;
  margin-bottom: 24px;
}

.cell {
  width: 70px;
  height: 70px;
  background: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  transition: all 0.2s ease;
  user-select: none;
}

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

.cell.current { 
  background: #1f2937; 
  border-color: var(--accent-blue); 
  box-shadow: inset 0 0 10px rgba(88, 166, 255, 0.2);
}

.cell.visited { 
  background: var(--cell-visited); 
  cursor: default; 
}

.cell.flagged { 
  background: #2a1012; 
  border-color: #6a2428; 
}

.cell.reachable { 
  border-color: var(--text-muted); 
  cursor: pointer; 
}
.cell.reachable:hover { 
  background: var(--cell-hover); 
  border-color: var(--accent-blue);
}

.controls { 
  display: flex; 
  gap: 12px; 
  margin-bottom: 16px; 
}

button {
  padding: 10px 20px; 
  border: 1px solid var(--accent-pink); 
  border-radius: 6px;
  cursor: pointer; 
  font-weight: bold; 
  font-size: 0.9rem;
  background: transparent;
  color: var(--accent-pink);
  transition: all 0.2s;
}

button:hover {
  background: var(--accent-pink);
  color: var(--bg-color);
}

.legend {
  font-size: 0.8rem; 
  color: var(--text-muted); 
  text-align: center;
  line-height: 2; 
  margin-top: 8px;
  background: var(--panel-bg);
  padding: 12px 20px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.overlay {
  position: fixed; inset: 0;
  background: rgba(13, 17, 23, 0.9);
  backdrop-filter: blur(4px);
  display: none; 
  flex-direction: column;
  align-items: center; 
  justify-content: center;
  font-size: 1.5rem;
  z-index: 100;
}
.overlay.show { display: flex; }
.overlay-msg { margin-bottom: 24px; text-align: center; line-height: 1.8; }