:root{--navy: #0f1e3d;--navy-hover: #1b2d55;--yellow: #ffd200;--yellow-hover: #f5c800;--bg: #fff;--card: #fff;--border: #dde2ea;--text: #0f1e3d;--muted: #6b7489;--column: 1530px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);height:100vh}#root{height:100vh}button{font:inherit}.icon-btn{border:none;background:transparent;cursor:pointer;color:var(--muted);padding:4px 6px;border-radius:6px;display:inline-flex;align-items:center}.icon-btn:hover{color:var(--text);background:rgba(15,30,61,.06)}.app{display:flex;flex-direction:column;height:100vh}.app-main{flex:1;display:flex;flex-direction:column;min-height:0}.header{display:flex;align-items:center;justify-content:space-between;height:100px;padding:0 48px;background:#fff;border-bottom:1px solid var(--border);flex-shrink:0}.logo{text-decoration:none;font-size:2.6rem;font-weight:800;letter-spacing:-.02em;color:var(--navy);display:flex;align-items:center}.logo-dot{width:16px;height:16px;border-radius:50%;background:var(--yellow);margin-left:12px;margin-top:6px}.header-right{display:flex;align-items:center;gap:24px}.no-access{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:24px;gap:12px;color:var(--muted)}.no-access h2{color:var(--text);font-size:1.6rem}.no-access p{max-width:520px;line-height:1.5}.header-user{color:var(--text);font-size:.9rem;font-weight:600;max-width:220px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.header-title{color:#4a5568;font-size:.95rem}.header-link{border:none;background:none;color:var(--muted);font-size:.9rem;cursor:pointer;text-decoration:underline;text-underline-offset:3px}.header-link:hover{color:var(--text)}.chat-view{flex:1;overflow-y:auto;padding:32px 24px 16px}.chat-view-empty .chat-column{min-height:100%}.chat-column{width:100%;max-width:var(--column);margin:0 auto;display:flex;flex-direction:column;gap:14px}.chat-empty{margin:auto;text-align:center;display:flex;flex-direction:column;align-items:center;padding-bottom:8vh}.chat-empty h2{font-size:1.6rem;font-weight:700;margin-bottom:24px}.btn-upload{background:var(--yellow);color:var(--navy);border:none;border-radius:10px;font-weight:600;font-size:1.05rem;padding:16px 48px;cursor:pointer;transition:background .15s}.btn-upload:hover:not(:disabled){background:var(--yellow-hover)}.btn-upload:disabled{opacity:.6;cursor:default}.chat-empty-hint{margin-top:18px;color:var(--muted);font-size:.95rem}.msg{max-width:100%;padding:14px 18px;border-radius:12px;line-height:1.55;word-wrap:break-word}.msg-user{align-self:flex-end;background:var(--navy);color:#fff;max-width:80%}.msg-user .msg-text{white-space:pre-wrap}.msg-assistant{align-self:stretch;background:var(--card);border:1px solid var(--border)}.msg-steps{background:transparent;border-style:dashed;font-size:.9rem;color:#4a5568}.msg-steps summary,.thinking summary{cursor:pointer;color:var(--muted);font-size:.85rem;-webkit-user-select:none;user-select:none}.msg-steps .md{margin-top:8px;padding-top:8px;border-top:1px dashed var(--border)}.thinking{margin-bottom:8px}.thinking-text{white-space:pre-wrap;font-size:.85rem;color:var(--muted);margin-top:6px;max-height:240px;overflow-y:auto}.typing{color:var(--muted);font-size:.9rem}.typing:after{content:"";display:inline-block;width:6px;height:6px;margin-left:8px;border-radius:50%;background:var(--yellow);animation:pulse 1s ease-in-out infinite}@keyframes pulse{0%,to{opacity:.3}50%{opacity:1}}.msg-files{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.file-link{display:inline-block;padding:8px 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pre{background:var(--navy);color:#e5e9f2;border-radius:8px;padding:12px;overflow-x:auto}.md pre code{background:none;padding:0;color:inherit}.md-table{overflow-x:auto}.md table{border-collapse:collapse;font-size:.9rem}.md th,.md td{border:1px solid var(--border);padding:6px 10px;text-align:left}.md th{background:#f4f6fa}.composer{padding:12px 24px 40px;flex-shrink:0}.composer-box,.composer-files{max-width:var(--column);margin:0 auto}.composer-box{display:flex;align-items:center;gap:6px;background:#fff;border:1px solid var(--border);border-radius:10px;padding:6px 8px 6px 18px}.composer-box:focus-within{border-color:#b9c2d3}.composer-box textarea{flex:1;border:none;outline:none;resize:none;font:inherit;font-size:.95rem;color:var(--text);background:transparent;padding:10px 0;max-height:160px}.composer-box textarea::placeholder{color:#8a93a6}.send-btn{width:46px;height:44px;border:none;border-radius:8px;background:var(--navy);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0}.send-btn:hover{background:var(--navy-hover)}.composer-files{display:flex;flex-wrap:wrap;align-items:center;gap:6px;margin-bottom:8px}.file-chip{display:inline-flex;align-items:center;gap:2px;background:#fff;border:1px solid var(--border);border-radius:14px;padding:3px 4px 3px 12px;font-size:.85rem}.composer-error{color:#b91c1c;font-size:.85rem}@media (max-width: 640px){.header{height:64px;padding:0 16px}.logo{font-size:1.6rem}.logo-dot{width:10px;height:10px;margin-left:8px}.header-title{display:none}.chat-empty h2{font-size:1.3rem}.composer{padding:8px 12px 16px}}.html-frame{margin-top:12px;border:1px solid var(--border);border-radius:10px;overflow:hidden;background:#fff}.html-frame-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:8px 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