* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: #1e293b; color: #f8fafc; min-height: 100vh; display: flex; flex-direction: column; align-items: center; padding: 1rem; }
header h1 { font-size: 2rem; color: #f472b6; margin-bottom: 1rem; }
.controls { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; justify-content: center; margin-bottom: 1rem; }
.controls select, .controls button { padding: 0.4rem 0.8rem; border-radius: 4px; border: none; font-size: 1rem; cursor: pointer; }
.controls button { background: #f472b6; color: #fff; font-weight: bold; }
.controls b { color: #f472b6; }
.board { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; max-width: 320px; }
.cell { width: 100px; height: 100px; background: #334155; border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 3rem; font-weight: bold; cursor: pointer; user-select: none; transition: background 0.15s; }
.cell:hover { background: #475569; }
.cell.x { color: #3b82f6; }
.cell.o { color: #ef4444; }
.info { margin-top: 1rem; font-size: 1.2rem; font-weight: bold; color: #fbbf24; min-height: 1.5rem; }
footer { margin-top: 1rem; }
footer a { color: #f472b6; text-decoration: none; }