*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--color-bg: #f9f9f7;--color-surface: #ffffff;--color-sidebar-bg: #1c2333;--color-sidebar-text: #c8cdd8;--color-sidebar-hover: #2a3449;--color-sidebar-active: #2d5a8e;--color-primary: #2d5a8e;--color-primary-hover: #234876;--color-text: #1a1a1a;--color-text-muted: #6b7280;--color-border: #e5e7eb;--color-user-bubble: #2d5a8e;--color-agent-bubble: #f3f4f6;--radius: 8px;--sidebar-width: 260px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Helvetica,Arial,sans-serif;font-size:15px;line-height:1.6;color:var(--color-text);background:var(--color-bg);-webkit-font-smoothing:antialiased}body{margin:0;height:100vh;overflow:hidden}#root{height:100vh;display:flex;flex-direction:column}button{font-family:inherit;cursor:pointer;border:none;border-radius:var(--radius);font-size:14px;font-weight:500;transition:background .15s,opacity .15s}button:disabled{opacity:.5;cursor:not-allowed}textarea,input{font-family:inherit;font-size:14px;color:var(--color-text);border:1px solid var(--color-border);border-radius:var(--radius);outline:none;transition:border-color .15s}textarea:focus,input:focus{border-color:var(--color-primary)}.app-shell{display:flex;height:100vh;overflow:hidden}.sidebar{width:var(--sidebar-width);flex-shrink:0;background:var(--color-sidebar-bg);color:var(--color-sidebar-text);display:flex;flex-direction:column;overflow:hidden}.sidebar-header{padding:20px 16px 12px;border-bottom:1px solid rgba(255,255,255,.08)}.sidebar-title{font-size:13px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:#ffffff73;margin-bottom:12px}.btn-new-chat{width:100%;padding:9px 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p{font-size:14px;text-align:center;max-width:380px}.message-row{display:flex;flex-direction:column;padding:4px 24px}.message-row.user{align-items:flex-end}.message-row.assistant{align-items:flex-start}.message-bubble{max-width:72%;padding:10px 14px;border-radius:12px;font-size:14px;line-height:1.65;white-space:pre-wrap;word-break:break-word}.message-bubble.user{background:var(--color-user-bubble);color:#fff;border-bottom-right-radius:3px}.message-bubble.assistant{background:var(--color-agent-bubble);color:var(--color-text);border-bottom-left-radius:3px}.message-bubble.assistant p{margin-bottom:8px}.message-bubble.assistant p:last-child{margin-bottom:0}.message-timestamp{font-size:10px;color:#999;margin-top:2px;padding:0 4px}.message-cost{color:#aaa}.session-cost{font-size:20px;color:#741d1d;text-align:center;padding:2px 0}.message-bubble.assistant h2{font-size:15px;margin:12px 0 4px}.message-bubble.assistant h3{font-size:14px;margin:10px 0 3px}.message-bubble.assistant strong{font-weight:600}.message-bubble.assistant a{color:var(--color-primary)}.message-bubble.assistant ul,.message-bubble.assistant ol{padding-left:20px;margin-bottom:8px}.typing-indicator{display:inline-flex;gap:4px;align-items:center;padding:4px 0}.typing-indicator span{width:6px;height:6px;background:var(--color-text-muted);border-radius:50%;animation:blink 1.2s infinite}.typing-indicator span:nth-child(2){animation-delay:.2s}.typing-indicator span:nth-child(3){animation-delay:.4s}@keyframes blink{0%,80%,to{opacity:.2}40%{opacity:1}}.chat-input-area{border-top:1px solid var(--color-border);padding:14px 24px;background:var(--color-surface)}.attached-files{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:8px}.file-chip{display:flex;align-items:center;gap:6px;padding:3px 8px 3px 10px;background:var(--color-agent-bubble);border-radius:20px;font-size:12px;color:var(--color-text-muted)}.file-chip button{padding:0;width:16px;height:16px;background:none;color:var(--color-text-muted);font-size:14px;line-height:1;display:flex;align-items:center;justify-content:center;border-radius:50%}.file-chip button:hover{background:var(--color-border)}.input-row{display:flex;gap:8px;align-items:flex-end}.chat-textarea{flex:1;resize:none;padding:10px 12px;min-height:44px;max-height:180px;overflow-y:auto;background:var(--color-bg);line-height:1.5}.btn-attach{width:40px;height:40px;padding:0;background:var(--color-bg);border:1px solid var(--color-border);color:var(--color-text-muted);display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0}.btn-attach:hover{background:var(--color-border)}.btn-send{width:40px;height:40px;padding:0;background:var(--color-primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0}.btn-send:hover:not(:disabled){background:var(--color-primary-hover)}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--color-bg)}.login-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:12px;padding:40px;width:100%;max-width:380px;box-shadow:0 4px 24px #0000000f}.login-card h1{font-size:20px;font-weight:700;color:var(--color-text);margin-bottom:4px}.login-card p{font-size:13px;color:var(--color-text-muted);margin-bottom:28px}.form-field{margin-bottom:16px}.form-field 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transparent;margin-bottom:-1px}.settings-tab.active{color:var(--color-primary);border-bottom-color:var(--color-primary);font-weight:500}.settings-body{flex:1;display:flex;flex-direction:column;padding:24px 28px;gap:12px;overflow:hidden}.settings-body p{font-size:13px;color:var(--color-text-muted)}.settings-split-view{flex:1;display:flex;gap:16px;overflow:hidden}.settings-editor-pane,.settings-preview-pane{flex:1;display:flex;flex-direction:column;overflow:hidden}.settings-editor{flex:1;resize:none;padding:14px;font-family:SFMono-Regular,Consolas,monospace;font-size:13px;line-height:1.7;background:var(--color-bg);border:1px solid var(--color-border);border-radius:6px}.settings-preview{flex:1;padding:14px;overflow-y:auto;background:var(--color-bg);border:1px solid var(--color-border);border-radius:6px;font-size:14px;line-height:1.7}.settings-preview h1{font-size:24px;font-weight:600;margin:16px 0 12px}.settings-preview h2{font-size:20px;font-weight:600;margin:14px 0 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var(--color-border)}.settings-status{font-size:13px;color:var(--color-text-muted);align-self:center}.settings-status.success{color:#16a34a}.settings-status.error{color:#dc2626}.settings-empty{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;text-align:center;padding:40px}.settings-empty p{font-size:14px;color:var(--color-text);max-width:400px}.settings-empty .btn-primary{padding:10px 24px;background:var(--color-primary);color:#fff;margin-top:8px}.settings-empty .btn-primary:hover{background:var(--color-primary-hover)}