:root{--ink:#183b51;--muted:#697f8c;--teal:#087c86;--orange:#e97538;--bg:#f0f6f8;--line:#dce7ec;--white:#fff;--shadow:0 8px 28px #24485e08;font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;color:var(--ink);background:var(--bg);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer;touch-action:manipulation}button:disabled{cursor:default}button,a{outline-offset:5px}button:focus-visible,a:focus-visible{outline:3px solid #f3964e}button{color:inherit}button:hover:not(:disabled){filter:brightness(.97)}button[hidden],[hidden]{display:none!important}a{color:inherit;text-decoration:none}.site-header{background:#fff;border-bottom:1px solid var(--line)}.header-inner{max-width:1220px;margin:auto;display:flex;align-items:center;gap:28px;padding:19px 30px}.brand{display:flex;align-items:center;gap:11px;font-size:23px;font-weight:850;letter-spacing:1px}.brand-mark{background:var(--teal);color:#fff;width:48px;height:48px;border-radius:15px 15px 15px 4px;display:grid;place-items:center;font-family:"Kaiti SC",KaiTi,serif;font-size:31px;box-shadow:3px 3px 0 #ffd5a5}.brand small{display:block;font-size:12px;font-weight:500;letter-spacing:2px;color:var(--muted);margin-top:2px}nav{display:flex;gap:7px;margin-left:auto}.nav-button{border:0;background:transparent;font-size:16px;padding:13px 18px;border-radius:12px;font-weight:700}.nav-button.active{color:var(--teal);background:#e7f5f4}.nav-button span{font-size:13px;background:#dcecea;padding:1px 7px;border-radius:6px;margin-left:5px}.icon-button{background:transparent;border:1px solid var(--line);border-radius:50%;width:42px;height:42px;display:grid;place-items:center;flex-shrink:0;font-size:21px}main{max-width:1220px;margin:auto;padding:31px 30px 0}.welcome-row{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:27px}.eyebrow{font-size:14px;color:var(--muted);margin-bottom:8px}h1{font-size:27px;letter-spacing:.3px;margin:0;line-height:1.5}h1 span{color:var(--orange)}.star-wallet{display:flex;align-items:center;gap:10px;background:#fff7e7;border:1px solid #f4dfb3;border-radius:16px;padding:13px 17px;white-space:nowrap}.star-wallet>span:first-child{color:#eea025;font-size:28px}.star-wallet strong{font-size:23px}.star-wallet>span:last-child{font-size:14px}.game-layout{display:grid;grid-template-columns:minmax(0,1fr) 292px;gap:26px}.level-bar{display:flex;align-items:center;justify-content:space-between;margin:2px 0 18px;min-height:30px;gap:8px}.level-bar>div{display:flex;align-items:center;gap:12px}.level-badge{background:#dbe9ed;padding:6px 10px;border-radius:7px;font-size:13px;font-weight:750}.level-bar strong{font-size:18px}.text-button{border:0;background:none;color:var(--teal);padding:7px 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.15s;padding:10px}.option:hover:not(:disabled){transform:translateY(-3px);border-color:#9bc7ca}.option .hanzi{font-size:48px;line-height:1.3;font-family:"Kaiti SC",STKaiti,KaiTi,"Noto Serif CJK SC",serif;color:#193f55}.option .choice-key{position:absolute;top:6px;left:10px;font-size:12px;color:#78909b}.option .pinyin{font-size:15px;min-height:0;color:#69818e}.option.correct{background:#e5f6ed;border-color:#40a67c}.option.correct:after{content:'✓';position:absolute;top:6px;right:9px;color:#218362;font-weight:800}.option.wrong{background:#fff0e7;border-color:#e39970;animation:shake .25s}.feedback{min-height:42px;line-height:1.65;font-size:16px;text-align:center;margin:12px 0 6px;color:var(--teal)}.feedback.try-again{color:#9b592d}.question-footer{display:flex;align-items:center;justify-content:space-between;gap:10px;min-height:44px}.hint-button{padding:10px 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