:root{--bg:#f3f5fb;--surface:#ffffff;--surface-muted:#eef2ff;--text:#0f172a;--text-muted:#5f6b85;--line:#dce3f3;--primary:#2d4689;--primary-hover:#243870;--primary-soft:#d7e1fb;--danger:#b42318;--danger-soft:#fde8e8;--radius-lg:22px;--radius-md:14px;--shadow-card:0 1px 1px rgba(15,23,42,0.04),0 8px 24px rgba(45,70,137,0.08)}*{box-sizing:border-box}body,html{margin:0;padding:0;min-height:100%;font-family:Inter,ui-sans-serif,system-ui,sans-serif;background:radial-gradient(circle at 10% 20%,rgba(45,70,137,.1),transparent 35%),radial-gradient(circle at 95% 10%,rgba(45,70,137,.12),transparent 30%),var(--bg);color:var(--text)}a{color:inherit;text-decoration:none}.app-shell{max-width:1200px;margin:0 auto;padding:24px}.topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.title{margin:0;font-size:1.7rem}.subtitle{margin:6px 0 0;color:var(--text-muted)}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);padding:18px}.card-header h2{margin:0 0 4px;font-size:1.1rem}.card-header p{margin:0 0 14px;color:var(--text-muted)}.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:16px;gap:16px}.btn{border:none;border-radius:12px;padding:10px 14px;font-size:.95rem;cursor:pointer;transition:all .2s ease}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-hover));color:white}.btn-primary:hover:not(:disabled){transform:translateY(-1px)}.btn-secondary{background:var(--surface-muted);color:var(--primary)}.btn-danger{background:var(--danger-soft);color:var(--danger)}.input,select,textarea{width:100%;border:1px solid var(--line);border-radius:12px;padding:10px 12px;font-size:.95rem;background:#fff}.input:focus,select:focus,textarea:focus{outline:2px solid 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var(--line);padding:16px}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.toast-stack{position:fixed;top:16px;right:16px;display:grid;grid-gap:10px;gap:10px;z-index:40}.toast{background:var(--primary);color:#fff;padding:10px 14px;border-radius:12px;box-shadow:var(--shadow-card)}.two-col{display:grid;grid-gap:16px;gap:16px;grid-template-columns:280px minmax(0,1fr)}.chat-sidebar{display:grid;grid-gap:8px;gap:8px}.chat-msg{padding:10px;border-radius:12px;white-space:pre-wrap;text-align:justify;text-justify:inter-word}.chat-markdown{width:100%;white-space:normal;line-height:1.6}.chat-markdown>:first-child{margin-top:0}.chat-markdown>:last-child{margin-bottom:0}.chat-markdown blockquote,.chat-markdown ol,.chat-markdown p,.chat-markdown pre,.chat-markdown ul{margin:0 0 .85rem}.chat-markdown h1,.chat-markdown h2,.chat-markdown h3,.chat-markdown h4{margin:1rem 0 .6rem;line-height:1.3}.chat-markdown h1{font-size:1.35rem}.chat-markdown 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a{color:var(--primary);text-decoration:underline}.chat-row{display:flex;width:100%;margin-bottom:14px}.chat-row-user{justify-content:flex-end}.chat-row-assistant{justify-content:flex-start}.chat-msg-user{width:auto;max-width:min(72ch,85%);background:linear-gradient(135deg,var(--primary),var(--primary-hover));color:#fff}.chat-msg-assistant{width:100%;max-width:100%;background:transparent;border:0;padding:2px 0;border-radius:0}.chat-msg-streaming:after{content:"";display:inline-block;width:.55em;height:1.05em;margin-left:.24em;vertical-align:-.12em;background:var(--primary);border-radius:2px;animation:stream-caret-blink .9s step-end infinite}@keyframes stream-caret-blink{0%,45%{opacity:1}46%,to{opacity:.15}}.chat-empty{min-height:52vh;display:grid;place-items:center;text-align:center;grid-gap:14px;gap:14px}.chat-empty h2{margin:0;font-size:clamp(1.3rem,2.5vw,2rem)}.chat-empty p{margin:0;color:var(--text-muted)}.chat-composer{position:-webkit-sticky;position:sticky;bottom:0;background:linear-gradient(to top,var(--bg) 70%,transparent);padding-top:12px}.chat-composer-centered{position:static;background:transparent;width:min(860px,100%);margin:0 auto}.chat-input-wrap{display:grid;grid-template-columns:1fr auto;align-items:center;grid-gap:10px;gap:10px;background:#dcdcdc;border:1px solid #aeb9d4;border-radius:999px;padding:8px 10px 8px 14px;box-shadow:0 8px 18px rgba(15,23,42,.06),inset 0 1px 0 rgba(255,255,255,.95)}.chat-input-wrap textarea{border:none;background:transparent;color:var(--text);resize:none;min-height:24px;max-height:260px;line-height:1.35;padding:6px 0;overflow-y:hidden}.chat-input-wrap textarea::placeholder{color:#8a94ac}.chat-input-wrap textarea:focus{outline:none}.chat-send-btn{width:36px;height:36px;border-radius:999px;cursor:pointer;background:#e6ecfb;color:#21366c;border:1px solid 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