:root{--bg-color: #000000;--surface-color: #1a1a1a;--text-primary: #ffffff;--text-secondary: #aaaaaa;--accent-color: #00e676;--highlight-color: #ffea00;--danger-color: #ff1744;--font-main: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--btn-large-height: 80px;--btn-large-font: 1.5rem}*{box-sizing:border-box}html,body{height:100%;margin:0;padding:0;font-family:var(--font-main);background-color:var(--bg-color);color:var(--text-primary);overflow:hidden}h1,h2,h3{margin:0;font-weight:600}.container{padding:20px;max-width:1200px;margin:0 auto}.btn-large{display:flex;align-items:center;justify-content:center;height:var(--btn-large-height);font-size:var(--btn-large-font);font-weight:700;border:none;border-radius:12px;background-color:var(--surface-color);color:var(--text-primary);cursor:pointer;width:100%;transition:transform .1s,background-color .2s;text-decoration:none;text-align:center;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent}.btn-large:active{transform:scale(.98);background-color:#333}.btn-large.primary{background-color:var(--accent-color);color:#000}.btn-large.warning{background-color:var(--highlight-color);color:#000}.btn-large.danger{background-color:var(--danger-color);color:#fff}.mt-20{margin-top:20px}.mb-20{margin-bottom:20px}.text-center{text-align:center}.version-info{font-size:.8rem;color:var(--text-secondary);opacity:.6}