:root{--bg: #0f1115;--bg-raised: #161a22;--bg-hover: #1d2230;--border: #262c3a;--border-soft: #1e2431;--text: #e6e9ef;--text-dim: #9aa3b5;--text-faint: #6b7386;--accent: #7c6cf0;--accent-soft: rgba(124, 108, 240, .14);--accent-strong: #9186f5;--danger: #e5697a;--ok: #58c08a;--radius: 12px;--radius-sm: 8px;--max-width: 780px;--font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;--mono: ui-monospace, "SF Mono", "Cascadia Code", Consolas, monospace}*{box-sizing:border-box}html,body{height:100%;margin:0}body{font-family:var(--font);background:var(--bg);color:var(--text);font-size:15px;line-height:1.65;overflow:hidden}#app{display:flex;flex-direction:column;height:100vh}.hidden{display:none!important}.topbar{display:flex;align-items:center;justify-content:space-between;padding:10px 20px;border-bottom:1px solid var(--border-soft);background:var(--bg-raised);flex:none}.brand{display:flex;align-items:baseline;gap:10px}.logo{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:8px;background:var(--accent);color:#fff;font-family:Georgia,serif;font-size:19px;align-self:center}.brand-name{font-weight:650;font-size:15px;letter-spacing:.2px}.brand-tag{color:var(--text-faint);font-size:12px}.topbar-right{display:flex;align-items:center;gap:10px}.model-badge{font-size:12px;color:var(--text-dim);background:var(--bg-hover);border:1px solid var(--border);border-radius:999px;padding:4px 12px;max-width:320px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.icon-btn{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:var(--radius-sm);border:none;background:transparent;color:var(--text-dim);cursor:pointer;transition:background .15s,color .15s}.icon-btn:hover{background:var(--bg-hover);color:var(--text)}.chat{flex:1;overflow-y:auto;scroll-behavior:smooth}.welcome{max-width:var(--max-width);margin:0 auto;padding:96px 24px 40px;text-align:center}.welcome-logo{width:72px;height:72px;margin:0 auto 20px;display:flex;align-items:center;justify-content:center;border-radius:20px;background:linear-gradient(135deg,var(--accent),#4f9cf5);color:#fff;font-family:Georgia,serif;font-size:44px;box-shadow:0 8px 32px #7c6cf059}.welcome h1{margin:0 0 8px;font-size:26px;font-weight:700}.welcome-sub{color:var(--text-dim);margin:0 auto 28px;max-width:520px}.suggestions{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}.suggestion{border:1px solid var(--border);background:var(--bg-raised);color:var(--text-dim);border-radius:999px;padding:8px 16px;font-size:13px;cursor:pointer;transition:all .15s;font-family:var(--font)}.suggestion:hover{border-color:var(--accent);color:var(--text);background:var(--accent-soft)}.messages{max-width:var(--max-width);margin:0 auto;padding:24px 20px 12px}.msg{margin-bottom:22px;animation:rise .18s ease-out}@keyframes rise{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}.msg-user{display:flex;flex-direction:column;align-items:flex-end;gap:8px}.msg-user .bubble{background:var(--accent-soft);border:1px solid rgba(124,108,240,.25);border-radius:var(--radius);padding:10px 16px;max-width:85%;white-space:pre-wrap;word-break:break-word}.msg-assistant .who{font-size:12px;color:var(--text-faint);margin-bottom:6px;display:flex;align-items:center;gap:6px}.msg-assistant .who:before{content:"π";font-family:Georgia,serif;color:var(--accent-strong);font-weight:700}.md{word-break:break-word}.md>:first-child{margin-top:0}.md>:last-child{margin-bottom:0}.md p{margin:.6em 0}.md h1,.md h2,.md h3,.md h4{margin:1.1em 0 .45em;line-height:1.35}.md h1{font-size:1.35em}.md h2{font-size:1.2em}.md h3{font-size:1.05em}.md ul,.md ol{padding-left:1.4em;margin:.5em 0}.md code{font-family:var(--mono);font-size:.88em;background:var(--bg-hover);border:1px solid var(--border-soft);border-radius:5px;padding:1px 6px}.md pre{background:var(--bg-raised);border:1px solid var(--border-soft);border-radius:var(--radius-sm);padding:14px 16px;overflow-x:auto;margin:.7em 0}.md pre code{background:none;border:none;padding:0;font-size:.86em;line-height:1.55}.md blockquote{margin:.6em 0;padding:2px 0 2px 14px;border-left:3px solid var(--border);color:var(--text-dim)}.md table{border-collapse:collapse;margin:.7em 0;font-size:.92em;display:block;overflow-x:auto;max-width:100%}.md th,.md td{border:1px solid var(--border);padding:6px 12px;text-align:left}.md th{background:var(--bg-raised)}.md a{color:var(--accent-strong);text-decoration:none}.md a:hover{text-decoration:underline}.md hr{border:none;border-top:1px solid var(--border);margin:1.2em 0}.cursor{display:inline-block;width:8px;height:16px;background:var(--accent-strong);border-radius:2px;vertical-align:-2px;margin-left:2px;animation:blink .9s steps(1) infinite}@keyframes blink{50%{opacity:0}}.tool-row{border:1px solid var(--border-soft);background:var(--bg-raised);border-radius:var(--radius-sm);margin:8px 0;overflow:hidden;font-size:13px}.tool-row summary{list-style:none;display:flex;align-items:center;gap:8px;padding:8px 12px;cursor:pointer;color:var(--text-dim);user-select:none}.tool-row summary::-webkit-details-marker{display:none}.tool-row summary:hover{background:var(--bg-hover)}.tool-row .chevron{transition:transform .15s;font-size:10px}.tool-row[open] .chevron{transform:rotate(90deg)}.tool-row .tool-name{font-family:var(--mono);color:var(--accent-strong);font-weight:600}.tool-row .tool-args{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-family:var(--mono);color:var(--text-faint)}.tool-row .tool-state{flex:none;font-size:11px}.tool-row .tool-state.running{color:var(--accent-strong)}.tool-row .tool-state.done{color:var(--ok)}.tool-row .tool-state.error{color:var(--danger)}.tool-row .tool-body{padding:4px 14px 10px;border-top:1px solid var(--border-soft);max-height:220px;overflow-y:auto}.tool-row .tool-body pre{margin:8px 0 0;font-family:var(--mono);font-size:12px;color:var(--text-dim);white-space:pre-wrap;word-break:break-all}.tool-row summary .spinner{width:12px;height:12px;flex:none;border:2px solid var(--border);border-top-color:var(--accent-strong);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.file-card{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--border);background:var(--bg-raised);border-radius:var(--radius-sm);padding:6px 12px;font-size:13px;color:var(--text-dim);max-width:100%}.file-card .fname{font-family:var(--mono);color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-card .fsize{color:var(--text-faint);font-size:11px;flex:none}.file-card.doc{border-color:#58c08a66}.file-card.doc .dl-btn{border:none;background:var(--ok);color:#06281a;border-radius:6px;padding:3px 10px;font-size:12px;cursor:pointer;font-family:var(--font);font-weight:600}.file-card.doc .dl-btn:hover{filter:brightness(1.1)}.msg-error{border:1px solid rgba(229,105,122,.4);background:#e5697a14;color:var(--danger);border-radius:var(--radius-sm);padding:10px 14px;font-size:13.5px;word-break:break-word}.composer-wrap{flex:none;padding:8px 16px 14px}.composer{max-width:var(--max-width);margin:0 auto;border:1px solid var(--border);background:var(--bg-raised);border-radius:var(--radius);padding:10px 12px;transition:border-color .15s}.composer:focus-within{border-color:var(--accent)}.attachments{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:6px}.attachments:not(:empty){padding-bottom:2px}.composer-row{display:flex;align-items:flex-end;gap:8px}#input{flex:1;resize:none;border:none;background:transparent;color:var(--text);font-family:var(--font);font-size:15px;line-height:1.55;max-height:180px;outline:none;padding:4px 2px}#input::placeholder{color:var(--text-faint)}.send-btn{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:var(--radius-sm);border:none;background:var(--accent);color:#fff;cursor:pointer;flex:none;transition:background .15s,opacity .15s}.send-btn:hover{background:var(--accent-strong)}.send-btn:disabled{opacity:.35;cursor:default}.stop{color:var(--danger);border:1px solid rgba(229,105,122,.4);border-radius:var(--radius-sm);width:34px;height:34px;font-size:11px;flex:none}.footnote{text-align:center;color:var(--text-faint);font-size:11.5px;margin:8px 0 0}.overlay{position:fixed;inset:0;background:#05070c99;backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:50}.settings{width:min(440px,calc(100vw - 32px));background:var(--bg-raised);border:1px solid var(--border);border-radius:16px;padding:22px 24px;box-shadow:0 16px 48px #00000080}.settings-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.settings-head h2{margin:0;font-size:17px}.field{display:block;margin-bottom:14px}.field span{display:block;font-size:12.5px;color:var(--text-dim);margin-bottom:6px}.field select,.field input{width:100%;background:var(--bg);border:1px solid var(--border);color:var(--text);border-radius:var(--radius-sm);padding:9px 12px;font-size:14px;font-family:var(--font);outline:none}.field select:focus,.field input:focus{border-color:var(--accent)}.hint{color:var(--text-faint);font-size:12px;line-height:1.5;margin:4px 0 16px}.primary-btn{width:100%;border:none;background:var(--accent);color:#fff;border-radius:var(--radius-sm);padding:10px 0;font-size:14.5px;font-weight:600;cursor:pointer;font-family:var(--font);transition:background .15s}.primary-btn:hover{background:var(--accent-strong)}@media(max-width:640px){.brand-tag,.model-badge{display:none}.welcome{padding-top:48px}}