:root{--bg: #fafaf7;--surface: #ffffff;--ink: #1c1c1a;--ink-soft: #5b5b56;--ink-muted: #8a8a82;--line: #e7e6df;--line-soft: #f0efe9;--accent: #2f4f3e;--accent-soft: #e7efe9;--gold: #b58838;--user-bubble: #2f4f3e;--user-ink: #f6f5ee;--shadow: 0 1px 2px rgba(28, 28, 26, .04), 0 8px 24px rgba(28, 28, 26, .04)}*{box-sizing:border-box}html,body,#root{margin:0;padding:0;height:100%;width:100%;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Hiragino Sans GB,Helvetica Neue,Helvetica,Arial,sans-serif;font-size:15px;line-height:1.7;-webkit-font-smoothing:antialiased}button{font-family:inherit;cursor:pointer}.page{display:flex;flex-direction:column;height:100vh;max-width:820px;margin:0 auto;background:var(--bg)}.topbar{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--line);background:#fafaf7eb;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.brand{display:flex;align-items:center;gap:12px}.brand-logo{width:36px;height:36px;border-radius:10px;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:18px}.brand-text{line-height:1.25}.brand-title{font-weight:600;font-size:15px;color:var(--ink)}.brand-sub{font-size:12px;color:var(--ink-muted);margin-top:2px}.ghost-btn{background:transparent;border:1px solid var(--line);color:var(--ink-soft);padding:6px 12px;border-radius:8px;font-size:13px;transition:all .15s ease}.ghost-btn:hover{background:var(--line-soft);color:var(--ink)}.topbar-actions{display:flex;align-items:center;gap:8px}.lang-toggle{display:inline-flex;align-items:center;gap:5px;background:var(--surface);border:1px solid var(--line);color:var(--ink-soft);padding:6px 10px;border-radius:8px;font-size:12.5px;font-weight:500;transition:all .15s ease;-webkit-user-select:none;user-select:none}.lang-toggle:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}.lang-toggle-globe{font-size:13px;line-height:1}.lang-toggle-label{font-variant:tabular-nums;letter-spacing:.02em;min-width:16px;text-align:center}.chat-area{flex:1;overflow-y:auto;padding:24px 20px 12px;scroll-behavior:smooth}.chat-area::-webkit-scrollbar{width:8px}.chat-area::-webkit-scrollbar-track{background:transparent}.chat-area::-webkit-scrollbar-thumb{background:var(--line);border-radius:4px}.welcome{margin:32px auto;max-width:640px;text-align:center}.welcome-emoji{font-size:56px;line-height:1;margin-bottom:12px}.welcome h1{font-size:26px;font-weight:600;margin:8px 0 12px;color:var(--ink)}.welcome-hint{color:var(--ink-soft);font-size:14px;line-height:1.7;max-width:540px;margin:0 auto 28px}.presets{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:20px}.preset-card{text-align:left;background:var(--surface);border:1px solid var(--line);padding:14px 16px;border-radius:12px;font-size:13px;line-height:1.6;color:var(--ink-soft);transition:all .15s ease}.preset-card:hover{border-color:var(--accent);color:var(--ink);box-shadow:var(--shadow)}@media (max-width: 600px){.presets{grid-template-columns:1fr}}.bubble{margin:16px 0;display:flex;gap:10px;animation:bubble-in .25s ease}@keyframes bubble-in{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.bubble-user{justify-content:flex-end}.bubble-user .bubble-body{background:var(--user-bubble);color:var(--user-ink);border-radius:18px 18px 4px;padding:10px 16px;max-width:78%;white-space:pre-wrap;box-shadow:var(--shadow)}.bubble-bot{justify-content:flex-start;align-items:flex-start}.bubble-bot .bubble-avatar{width:32px;height:32px;border-radius:50%;background:var(--accent-soft);color:var(--accent);display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0;margin-top:4px}.bubble-bot .bubble-body{background:var(--surface);border:1px solid var(--line);border-radius:4px 18px 18px;padding:14px 18px;max-width:calc(100% - 50px);box-shadow:var(--shadow)}.thinking{display:flex;align-items:center;gap:8px;color:var(--ink-soft);font-size:13.5px;padding:4px 0}.thinking-icon{font-size:16px}.thinking-soft{color:var(--ink-muted);font-style:italic;font-size:13px}.dots{display:inline-flex;gap:3px}.dots i{width:6px;height:6px;border-radius:50%;background:var(--accent);display:inline-block;animation:dot-bounce 1.2s infinite ease-in-out}.dots i:nth-child(1){animation-delay:0s}.dots i:nth-child(2){animation-delay:.18s}.dots i:nth-child(3){animation-delay:.36s}@keyframes dot-bounce{0%,60%,to{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-3px)}}.tool-track{display:flex;flex-wrap:wrap;gap:6px;padding:4px 0 10px;border-bottom:1px dashed var(--line-soft);margin-bottom:10px}.tool-step{display:inline-flex;align-items:center;gap:5px;font-size:12px;padding:3px 9px;border-radius:999px;background:var(--line-soft);color:var(--ink-soft);border:1px solid transparent;transition:all .2s}.tool-step.done{background:var(--accent-soft);color:var(--accent)}.tool-step.active{background:var(--accent);color:#fff;animation:tool-pulse 1.4s infinite ease-in-out}@keyframes tool-pulse{0%,to{box-shadow:0 0 #2f4f3e59}50%{box-shadow:0 0 0 5px #2f4f3e00}}.tool-step-icon{font-size:13px}.tool-step-dots{display:inline-flex;gap:2px;margin-left:2px}.tool-step-dots i{width:3px;height:3px;border-radius:50%;background:#ffffffd9;display:inline-block;animation:dot-bounce 1.2s infinite ease-in-out}.tool-step-dots i:nth-child(2){animation-delay:.18s}.tool-step-dots i:nth-child(3){animation-delay:.36s}.cursor{display:inline-block;width:6px;height:14px;background:var(--accent);margin-left:2px;vertical-align:text-bottom;animation:cursor-blink 1s infinite}@keyframes cursor-blink{0%,49%{opacity:1}50%,to{opacity:0}}.md{font-size:14.5px;line-height:1.75}.md-p{margin:0}.md-br{height:8px}.md-h{font-weight:600;margin:12px 0 6px;color:var(--ink)}.md-h-1{font-size:17px}.md-h-2{font-size:15.5px}.md-h-3{font-size:14.5px;color:var(--accent)}.md-li{margin:2px 0 2px 20px;padding-left:4px;list-style:disc}.md-li-num{list-style:decimal}.md code{background:var(--line-soft);color:var(--accent);padding:1px 6px;border-radius:4px;font-family:SF Mono,Menlo,Monaco,Consolas,monospace;font-size:13px}.md strong{color:var(--ink);font-weight:600}.citation{display:inline-flex;align-items:center;gap:6px;background:linear-gradient(135deg,#f8f6ed,#f1eede);border:1px solid #e3d9b8;color:#6b5320;padding:3px 10px;border-radius:999px;font-size:12.5px;line-height:1.4;margin:0 4px;vertical-align:middle;transition:all .15s}.citation:hover{border-color:var(--gold);color:var(--gold);background:linear-gradient(135deg,#fbf7e9,#f6efd2)}.citation-icon{font-size:12px}.citation-page{background:#b588382e;padding:1px 6px;border-radius:999px;font-size:11px;font-weight:600}.lightbox{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;background:#141412c7;display:flex;align-items:center;justify-content:center;padding:24px;animation:bubble-in .15s ease}.lightbox-inner{background:var(--surface);border-radius:12px;max-width:92vw;max-height:92vh;display:flex;flex-direction:column;overflow:hidden;box-shadow:0 20px 60px #0006}.lightbox-bar{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;border-bottom:1px solid var(--line);font-size:13px;color:var(--ink-soft)}.lightbox img{max-width:100%;max-height:calc(92vh - 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