:root{--bg-dark: #1e1e24;--card-dark: #2b2b36;--card-light: #383845;--text-main: #f5f5f7;--text-muted: #9ba1a6;--accent-orange: #ff6b35;--accent-orange-hover: #ff8559;--radius-lg: 16px;--radius-md: 10px;--radius-sm: 6px;--shadow-sm: 0 4px 6px rgba(0, 0, 0, .1);--shadow-md: 0 8px 15px rgba(0, 0, 0, .2);--transition-fast: .2s ease;--transition-smooth: .3s cubic-bezier(.25, .8, .25, 1)}body{margin:0;padding:0;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background-color:var(--bg-dark);color:var(--text-main);-webkit-font-smoothing:antialiased;min-height:100vh}.app-container{display:flex;flex-direction:column;min-height:100vh;max-width:600px;margin:0 auto;position:relative;background-color:var(--bg-dark);box-shadow:0 0 20px #00000080}h1,h2,h3{margin:0;font-weight:700}h1{font-size:24px;color:var(--text-main)}h2{font-size:20px;color:var(--text-main)}p{font-size:16px;color:var(--text-muted);line-height:1.5}.btn-primary{background:var(--accent-orange);color:#fff;border:none;padding:14px 24px;font-size:16px;font-weight:600;border-radius:var(--radius-md);cursor:pointer;transition:var(--transition-smooth);box-shadow:0 4px 12px #ff6b354d;width:100%;display:flex;justify-content:center;align-items:center;gap:8px}.btn-primary:hover{background:var(--accent-orange-hover);transform:translateY(-2px);box-shadow:0 6px 16px #ff6b3566}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:transparent;color:var(--accent-orange);border:2px solid var(--accent-orange);padding:12px 24px;font-size:16px;font-weight:600;border-radius:var(--radius-md);cursor:pointer;transition:var(--transition-fast);width:100%}.btn-secondary:hover{background:#ff6b351a}.input-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin-top:20px}.bingo-input{width:100%;aspect-ratio:1;background:var(--card-light);border:2px solid transparent;border-radius:var(--radius-sm);color:var(--text-main);font-size:18px;font-weight:700;text-align:center;transition:var(--transition-fast)}.bingo-input:focus{outline:none;border-color:var(--accent-orange);background:var(--card-dark)}.bingo-input::placeholder{color:#fff3}.header-ad-container{width:100%;height:60px;background-color:var(--card-dark);position:relative;overflow:hidden;border-bottom:1px solid rgba(255,255,255,.05)}.ad-banner{width:100%;height:100%;object-fit:cover;transition:opacity .5s ease-in-out}.content-area{flex:1;padding:24px;display:flex;flex-direction:column}.bingo-header-letters{display:grid;grid-template-columns:repeat(5,1fr);margin-bottom:10px;text-align:center}.bingo-letter{font-size:24px;font-weight:800;color:var(--accent-orange)}body{margin:0}