:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400}body{margin:0;min-width:320px;min-height:100vh}.board-size-selector{text-align:center;padding:2rem;background:#f5f5f5;border-radius:8px;margin-bottom:2rem}.board-size-selector h2{margin-bottom:1.5rem;color:#333}.size-buttons{display:flex;gap:1rem;flex-wrap:wrap;justify-content:center}.size-button{padding:1rem 1.5rem;border:2px solid #333;background:#fff;cursor:pointer;font-size:16px;font-weight:700;border-radius:4px;transition:all .3s ease}.size-button:hover{background:#e0e0e0;transform:translateY(-2px)}.size-button.active{background:#4caf50;color:#fff;border-color:#4caf50}@media(max-width:768px){.board-size-selector{padding:1rem}.size-button{padding:.75rem 1rem;font-size:14px}}.bingo-cell{border:2px solid #333;padding:.5rem;display:flex;flex-direction:column;gap:.5rem;background:#fff;position:relative;min-height:80px;transition:all .3s ease}.bingo-cell.checked{background:#e8f5e9}.bingo-cell.strikethrough:after{content:"";position:absolute;top:50%;left:0;right:0;height:3px;background:red;transform:translateY(-50%);z-index:10}.bingo-checkbox{width:20px;height:20px;cursor:pointer}.bingo-input{border:1px solid #ccc;padding:.5rem;font-size:14px;width:100%;box-sizing:border-box}.bingo-text{cursor:pointer;padding:.5rem;min-height:40px;word-wrap:break-word;font-size:14px;color:#333}.bingo-text:empty:before{content:"Klicken zum Bearbeiten";color:#999}@media(max-width:768px){.bingo-cell{min-height:60px}.bingo-text,.bingo-input{font-size:12px}}.bingo-board-container{width:100%;max-width:1200px;margin:0 auto;padding:1rem}.bingo-board{display:grid;gap:4px;background:#333;border:4px solid #333;width:100%;aspect-ratio:1}@media(max-width:768px){.bingo-board-container{padding:.5rem}.bingo-board{gap:2px;border:2px solid #333}}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background:#f0f0f0;min-height:100vh}.app{min-height:100vh;padding:1rem}.app-header{text-align:center;padding:2rem 1rem;display:flex;justify-content:space-between;align-items:center;max-width:1200px;margin:0 auto}.app-header h1{font-size:2.5rem;color:#333;flex:1}.reset-button{padding:.75rem 1.5rem;background:#f44336;color:#fff;border:none;border-radius:4px;font-size:16px;cursor:pointer;transition:all .3s ease}.reset-button:hover{background:#d32f2f;transform:translateY(-2px)}@media(max-width:768px){.app-header{flex-direction:column;gap:1rem;padding:1rem}.app-header h1{font-size:1.8rem}.reset-button{font-size:14px;padding:.5rem 1rem}}