*{margin:0;padding:0;box-sizing:border-box}:root{--bg: #1a1d2e;--bg-2: #242840;--card: #fdf6e3;--card-back: #4a5568;--accent: #f6ad55;--accent-2: #68d391;--danger: #fc8181;--text: #1a202c;--text-light: #e2e8f0;--border: #2d3748;--pos-pron: #9f7aea;--pos-noun: #4299e1;--pos-verb: #f6ad55;--pos-adj: #68d391;--pos-adv: #ed64a6;--pos-prep: #38b2ac;--pos-conj: #cbd5e0;--pos-measure: #e53e3e}body{font-family:PingFang SC,Microsoft YaHei,Helvetica Neue,Arial,sans-serif;background:linear-gradient(135deg,var(--bg) 0%,var(--bg-2) 100%);color:var(--text-light);min-height:100vh;overflow-x:hidden}#app{width:100%;min-height:100vh}.menu{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;gap:24px;padding:20px}.menu h1{font-size:42px;background:linear-gradient(90deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:8px}.menu 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