:root{--paper: #f9f4e8;--ink: #2c2c2c;--gold: #d4af37;--red: #8b0000;--border: #e0d8c3}body{margin:0;padding:0;background-color:#e5e5e5;background-image:radial-gradient(#d1d1d1 1px,transparent 1px);background-size:20px 20px;font-family:"Noto Serif SC","Source Han Serif SC",Songti SC,serif;color:var(--ink)}.app-container{max-width:500px;margin:40px auto;min-height:700px;background:var(--paper);position:relative;box-shadow:0 20px 50px #00000026;border:1px solid var(--border);overflow:hidden;display:flex;flex-direction:column}.cloud-badge{position:absolute;top:12px;right:12px;font-size:10px;color:#999;display:flex;align-items:center;gap:4px;z-index:10}.panel{flex:1;padding:40px 30px;display:flex;flex-direction:column;align-items:center;text-align:center}.ink-stamp{width:60px;height:60px;border:3px solid var(--red);color:var(--red);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:24px;margin-bottom:20px;transform:rotate(-5deg);box-shadow:2px 2px #8b000033}h1{font-size:32px;margin:0;letter-spacing:4px}.subtitle{color:#666;margin-bottom:40px}.stat-card{background:#d4af371a;padding:15px 30px;border-radius:50px;display:flex;align-items:center;gap:10px;margin-bottom:40px;border:1px solid var(--gold)}.icon-gold{color:var(--gold)}.btn-primary{background:var(--ink);color:#fff;border:none;padding:15px 60px;font-size:18px;border-radius:4px;cursor:pointer;transition:all .3s;margin-bottom:15px;width:100%}.btn-primary:hover{background:#000;transform:translateY(-2px)}.btn-secondary{background:transparent;color:var(--ink);border:1px solid var(--ink);padding:12px 40px;font-size:16px;border-radius:4px;cursor:pointer;width:100%}.quiz-header{width:100%;display:flex;justify-content:space-between;align-items:center;margin-bottom:30px}.progress-bar{flex:1;height:6px;background:#eee;margin:0 20px;border-radius:3px;overflow:hidden}.progress-fill{height:100%;background:var(--gold);transition:width .5s ease}.question-box{background:#fff;padding:40px 20px;width:100%;border-top:2px solid var(--ink);border-bottom:2px solid var(--ink);margin-bottom:40px;position:relative}.idiom-display{font-size:48px;font-weight:700;letter-spacing:15px;padding-left:15px}.options-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px;width:100%}.option-btn{background:#fff;border:1px solid var(--border);padding:20px 10px;font-size:18px;cursor:pointer;display:flex;align-items:center;gap:10px;transition:all .2s}.option-label{font-size:12px;color:#999;border:1px solid #eee;width:20px;height:20px;display:flex;align-items:center;justify-content:center}.option-btn.correct{background:#f0fff4;border-color:#48bb78;color:#2f855a}.feedback-overlay{position:absolute;bottom:40px;left:30px;right:30px;background:#fff;padding:20px;box-shadow:0 -10px 30px #0000001a;border-radius:8px;border-left:5px solid var(--gold)}.feedback-overlay.correct{border-color:#48bb78;color:#2f855a}.feedback-overlay.wrong{border-color:var(--red);color:var(--red)}.meaning{margin-top:10px;font-size:14px;color:#666;line-height:1.6}.ink-circle{width:180px;height:180px;border:2px solid var(--ink);border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;margin-bottom:40px}.final-score{font-size:64px;font-weight:700;line-height:1}.wrong-review{width:100%;text-align:left;background:#00000008;padding:20px;border-radius:8px;margin-bottom:30px}.wrong-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}.wrong-item{background:#fff;padding:4px 12px;border-radius:4px;font-size:14px;border:1px solid var(--border)}.actions{width:100%;display:flex;flex-direction:column;gap:10px}