@import"https://fonts.googleapis.com/css2?family=Cinzel:wght@700&family=Noto+Serif+SC:wght@700&family=Playfair+Display:ital,wght@1,400;1,700&display=swap";.answer-book-container{min-height:100vh;background:radial-gradient(circle at center,#1a0b2e 0%,var(--color-black) 100%);display:flex;justify-content:center;align-items:center;perspective:1000px;overflow:hidden;font-family:"Noto Serif SC",serif;position:relative}.mystic-stars{position:absolute;width:2px;height:2px;background:transparent;box-shadow:10vw 10vh var(--color-white),20vw 80vh var(--color-white),40vw 30vh var(--color-white),60vw 50vh var(--color-white),80vw 20vh var(--color-white),90vw 90vh var(--color-white),15vw 60vh var(--color-white),35vw 90vh var(--color-white),55vw 10vh var(--color-white),75vw 70vh var(--color-white),85vw 40vh var(--color-white);animation:twinkle 5s infinite linear}.mystic-stars:after{content:" ";position:absolute;top:200px;left:200px;width:1px;height:1px;background:transparent;box-shadow:15vw 15vh var(--color-white),25vw 85vh var(--color-white),45vw 35vh var(--color-white),65vw 55vh var(--color-white),85vw 25vh var(--color-white),95vw 95vh var(--color-white)}@keyframes twinkle{0%{transform:translateY(0);opacity:.5}50%{opacity:1}to{transform:translateY(-var(--space-5));opacity:.5}}.book-stage{width:320px;height:480px}.flip-card{width:100%;height:100%;position:relative;transition:transform 1s cubic-bezier(.4,0,.2,1);transform-style:preserve-3d;cursor:pointer}.flip-card.flipped{transform:rotateY(180deg);cursor:default}.flip-card-inner{position:relative;width:100%;height:100%;text-align:center;transition:transform .8s;transform-style:preserve-3d}.flip-card-front,.flip-card-back{position:absolute;width:100%;height:100%;-webkit-backface-visibility:hidden;backface-visibility:hidden;border-radius:var(--space-3);box-shadow:0 var(--space-5) 50px #00000080}.flip-card-front{background:linear-gradient(135deg,#2c0a3d,#100516);color:#e0c097;border:2px solid #5c4b6e;display:flex;align-items:center;justify-content:center}.book-cover-design{width:90%;height:90%;border:2px solid #8e734a;position:relative;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:var(--space-5);box-sizing:border-box}.corner-decor{position:absolute;width:30px;height:30px;border:2px solid #8e734a}.top-left{top:10px;left:10px;border-right:none;border-bottom:none}.top-right{top:10px;right:10px;border-left:none;border-bottom:none}.bottom-left{bottom:10px;left:10px;border-right:none;border-top:none}.bottom-right{bottom:10px;right:10px;border-left:none;border-top:none}.book-title-group{margin-bottom:60px}.book-subtitle{font-size:.8rem;letter-spacing:3px;margin-bottom:5px;opacity:.8}.book-title{font-family:Cinzel,serif;font-size:3rem;margin:0;background:linear-gradient(to bottom,var(--color-warning-50),#c6a47e);-webkit-background-clip:text;-webkit-text-fill-color:transparent;filter:drop-shadow(0 2px 4px rgba(0,0,0,.5))}.book-cn-title{font-size:1.2rem;letter-spacing:10px;margin-top:5px;opacity:.9;color:#c6a47e}.instruction-text{font-size:.9rem;line-height:1.8;color:#bfa588;font-style:italic;min-height:40px}.pulsing-text{animation:pulse 1.5s infinite;color:var(--color-white);text-shadow:0 0 10px rgba(255,255,255,.5)}.flip-card-back{background:var(--color-warning-100);color:#333;transform:rotateY(180deg);display:flex;align-items:center;justify-content:center;background-image:url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 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fill-rule='evenodd'/%3E%3C/svg%3E");padding:30px;box-sizing:border-box}.answer-content{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;width:100%}.answer-cn{font-size:2.2rem;font-weight:700;margin-bottom:10px;color:#2c3e50;line-height:1.3}.answer-en{font-size:1rem;font-family:Playfair Display,serif;font-style:italic;color:#7f8c8d}.answer-divider{width:40px;height:2px;background:#e0e0e0;margin:40px 0}.reset-btn{background:transparent;border:1px solid #333;padding:10px 25px;font-family:inherit;font-size:.9rem;cursor:pointer;transition:all .2s;text-transform:uppercase;letter-spacing:2px;color:#333}.reset-btn:hover{background:#333;color:#fff}.error-toast{position:absolute;bottom:30px;background:#e74c3ce6;color:#fff;padding:10px var(--space-5);border-radius:4px;animation:fadeUp .3s ease-out}@keyframes pulse{0%{transform:scale(1);opacity:1}50%{transform:scale(1.05);opacity:.8}to{transform:scale(1);opacity:1}}@keyframes fadeUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@media (max-width: 480px){.book-stage{width:85vw;height:130vw;max-height:60vh}.book-title{font-size:2.5rem}.answer-cn{font-size:1.8rem}}