.chat-container{display:flex;flex-direction:column;height:100vh;max-width:800px;margin:0 auto;position:relative}.chat-header{display:flex;align-items:center;justify-content:space-between;padding:16px 24px;border-bottom:1px solid var(--border-subtle);background:#0a0a0fd9;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);position:sticky;top:0;z-index:10}.header-left{display:flex;align-items:center;gap:12px}.header-icon{font-size:24px}.header-title{font-size:18px;font-weight:600;color:var(--accent-gold);letter-spacing:2px}.reset-btn{background:none;border:1px solid var(--border-subtle);color:var(--text-secondary);cursor:pointer;padding:8px;border-radius:var(--radius-sm);transition:all .3s ease;display:flex;align-items:center}.reset-btn:hover{border-color:var(--accent-gold);color:var(--accent-gold);background:#c9a84c14}.header-right{display:flex;align-items:center;gap:10px}.lang-switcher{display:flex;background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-sm);overflow:hidden}.lang-btn{padding:5px 12px;background:none;border:none;color:var(--text-muted);font-family:inherit;font-size:12px;cursor:pointer;transition:all .25s ease;letter-spacing:.5px}.lang-btn:hover{color:var(--text-secondary);background:#c9a84c0f}.lang-btn-active{color:var(--accent-gold);background:#c9a84c1f;font-weight:600}.welcome-lang{position:absolute;top:24px;right:24px;z-index:5}.chat-messages{flex:1;overflow-y:auto;padding:24px 16px;display:flex;flex-direction:column;gap:20px;scroll-behavior:smooth}.message-row{display:flex;align-items:flex-start;gap:12px;animation:fadeInUp .4s ease}.message-user{justify-content:flex-end}.message-ai{justify-content:flex-start}@keyframes fadeInUp{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.avatar{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0}.ai-avatar{background:linear-gradient(135deg,var(--bg-card),rgba(201,168,76,.2));border:1px solid var(--border-subtle)}.user-avatar{background:linear-gradient(135deg,var(--accent-purple),var(--accent-gold-dim));border:1px solid rgba(124,111,170,.3)}.message-bubble{max-width:75%;padding:14px 18px;border-radius:var(--radius-md);line-height:1.7;font-size:15px}.bubble-ai{background:var(--bg-card);border:1px solid var(--border-subtle);border-top-left-radius:4px;color:var(--text-primary)}.bubble-user{background:linear-gradient(135deg,#c9a84c26,#7c6faa1f);border:1px solid rgba(201,168,76,.25);border-top-right-radius:4px;color:var(--text-primary)}.message-text{white-space:pre-wrap;word-break:break-word}.typing-cursor{display:inline;color:var(--accent-gold);animation:blink 1s step-end infinite;font-weight:300;margin-left:1px}@keyframes blink{0%,50%{opacity:1}51%,to{opacity:0}}.chat-input-area{padding:16px 24px 24px;border-top:1px solid var(--border-subtle);background:#0a0a0fe6;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px)}.input-form{display:flex;gap:12px;max-width:100%}.chat-input{flex:1;padding:14px 20px;background:var(--bg-input);border:1px solid var(--border-subtle);border-radius:var(--radius-md);color:var(--text-primary);font-family:inherit;font-size:15px;outline:none;transition:all .3s ease}.chat-input:focus{border-color:var(--accent-gold);box-shadow:0 0 0 3px #c9a84c1a}.chat-input:disabled{opacity:.5;cursor:not-allowed}.chat-input::placeholder{color:var(--text-muted)}.send-btn,.stop-btn{padding:14px 18px;border:none;border-radius:var(--radius-md);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .3s ease}.send-btn{background:linear-gradient(135deg,var(--accent-gold),var(--accent-gold-dim));color:var(--bg-primary)}.send-btn:hover:not(:disabled){background:linear-gradient(135deg,var(--accent-gold-light),var(--accent-gold));box-shadow:0 0 20px #c9a84c4d}.send-btn:disabled{opacity:.4;cursor:not-allowed}.stop-btn{background:#dc3c3c26;border:1px solid rgba(220,60,60,.3);color:#dc3c3c}.stop-btn:hover{background:#dc3c3c40}.welcome-container{height:100vh;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}.welcome-bg{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none}.star{position:absolute;width:3px;height:3px;background:var(--accent-gold);border-radius:50%;animation:twinkle 3s ease-in-out infinite}.star-1{top:15%;left:20%;animation-delay:0s}.star-2{top:25%;right:15%;animation-delay:1s}.star-3{bottom:30%;left:10%;animation-delay:2s}@keyframes twinkle{0%,to{opacity:.2;transform:scale(1)}50%{opacity:1;transform:scale(1.5)}}.glow-orb{position:absolute;border-radius:50%;filter:blur(80px);opacity:.08}.orb-1{width:400px;height:400px;background:var(--accent-gold);top:-100px;right:-100px;animation:float 8s ease-in-out infinite}.orb-2{width:300px;height:300px;background:var(--accent-purple);bottom:-80px;left:-80px;animation:float 10s ease-in-out infinite reverse}@keyframes float{0%,to{transform:translate(0)}50%{transform:translate(20px,-20px)}}.welcome-content{text-align:center;z-index:1;padding:0 24px;max-width:520px;animation:fadeIn 1s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.book-icon{font-size:64px;margin-bottom:24px;animation:breathe 3s ease-in-out infinite}@keyframes breathe{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}.welcome-title{font-size:36px;font-weight:700;color:var(--accent-gold);letter-spacing:8px;margin-bottom:12px;text-shadow:0 0 40px rgba(201,168,76,.3)}.welcome-subtitle{font-size:16px;color:var(--text-secondary);margin-bottom:24px;letter-spacing:3px}.welcome-desc{font-size:14px;color:var(--text-muted);line-height:1.8;margin-bottom:36px}.welcome-form{margin-bottom:24px}.input-wrapper{display:flex;gap:12px;background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);padding:6px 6px 6px 20px;transition:all .3s ease}.input-wrapper:focus-within{border-color:var(--accent-gold);box-shadow:var(--shadow-glow)}.welcome-input{flex:1;background:none;border:none;color:var(--text-primary);font-family:inherit;font-size:15px;outline:none;padding:12px 0}.welcome-input::placeholder{color:var(--text-muted)}.welcome-btn{padding:12px 24px;background:linear-gradient(135deg,var(--accent-gold),var(--accent-gold-dim));border:none;border-radius:var(--radius-md);color:var(--bg-primary);font-family:inherit;font-size:15px;font-weight:600;cursor:pointer;display:flex;align-items:center;gap:6px;transition:all .3s ease;letter-spacing:2px}.welcome-btn:hover:not(:disabled){background:linear-gradient(135deg,var(--accent-gold-light),var(--accent-gold));box-shadow:0 0 24px #c9a84c4d}.welcome-btn:disabled{opacity:.4;cursor:not-allowed}.welcome-hints{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}.hint-tag{padding:6px 16px;background:#c9a84c14;border:1px solid var(--border-subtle);border-radius:20px;color:var(--text-secondary);font-size:13px;cursor:pointer;transition:all .3s ease}.hint-tag:hover{border-color:var(--accent-gold);color:var(--accent-gold);background:#c9a84c26}@media(max-width:640px){.chat-header{padding:12px 16px}.chat-messages{padding:16px 12px}.message-bubble{max-width:85%;font-size:14px;padding:12px 14px}.chat-input-area{padding:12px 16px 20px}.welcome-title{font-size:28px;letter-spacing:5px}.welcome-desc{font-size:13px}.welcome-btn{padding:10px 18px;font-size:14px}.avatar{width:30px;height:30px;font-size:15px}}*{margin:0;padding:0;box-sizing:border-box}:root{--bg-primary: #0a0a0f;--bg-secondary: #12121a;--bg-card: #1a1a2e;--bg-input: #16162a;--text-primary: #e8e6e3;--text-secondary: #9a98a6;--text-muted: #6b6880;--accent-gold: #c9a84c;--accent-gold-light: #e4c76b;--accent-gold-dim: #8a7234;--accent-purple: #7c6faa;--border-subtle: rgba(201, 168, 76, .15);--border-active: rgba(201, 168, 76, .4);--shadow-glow: 0 0 30px rgba(201, 168, 76, .08);--shadow-card: 0 4px 24px rgba(0, 0, 0, .3);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 20px}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:"Noto Serif SC",Georgia,serif;background:var(--bg-primary);color:var(--text-primary);min-height:100vh;overflow:hidden}#root{min-height:100vh;display:flex;flex-direction:column}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--accent-gold-dim);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--accent-gold)}::selection{background:#c9a84c4d;color:var(--text-primary)}