:root{--primary: #2563eb;--primary-dark: #1d4ed8;--primary-light: #eff6ff;--primary-border: #bfdbfe;--success-bg: #dcfce7;--success-text: #15803d;--error: #dc2626;--error-bg: #fef2f2;--error-border: #fecaca;--warn-text: #d97706;--gray-50: #f9fafb;--gray-100: #f3f4f6;--gray-200: #e5e7eb;--gray-400: #9ca3af;--gray-600: #4b5563;--gray-900: #111827;--radius: 8px;--shadow: 0 1px 3px rgba(0, 0, 0, .12), 0 1px 2px rgba(0, 0, 0, .08);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -2px rgba(0, 0, 0, .05)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,sans-serif;background:var(--gray-50);color:var(--gray-900);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased}.btn{display:inline-flex;align-items:center;justify-content:center;padding:8px 16px;border-radius:var(--radius);font-size:14px;font-weight:500;border:none;cursor:pointer;transition:background .15s,color .15s,box-shadow .15s;text-decoration:none;white-space:nowrap;line-height:1.4}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--primary-dark)}.btn-primary:disabled{opacity:.55;cursor:not-allowed}.btn-ghost{background:transparent;color:var(--gray-600)}.btn-ghost:hover{background:var(--gray-100);color:var(--gray-900)}.btn-full{width:100%;padding:10px 16px;font-size:15px}.header{background:#fff;border-bottom:1px solid var(--gray-200);padding:0 24px;height:60px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100}.header-brand{display:flex;align-items:center;gap:12px;-webkit-user-select:none;user-select:none}.header-logo{width:36px;height:36px;background:var(--primary);color:#fff;border-radius:8px;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:17px;flex-shrink:0}.header-title{font-weight:700;font-size:16px;line-height:1.2}.header-subtitle{font-size:12px;color:var(--gray-600);line-height:1.2}.header-right{display:flex;align-items:center;gap:12px}.header-email{font-size:13px;color:var(--gray-600)}.auth-container{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;background:linear-gradient(135deg,#f0f4ff 0%,var(--gray-50) 100%)}.auth-card{background:#fff;border-radius:12px;padding:40px;width:100%;max-width:400px;box-shadow:var(--shadow-lg)}.auth-header{text-align:center;margin-bottom:32px}.auth-logo{font-size:30px;font-weight:800;color:var(--primary);letter-spacing:-.5px}.auth-tagline{color:var(--gray-600);font-size:14px;margin-top:6px}.tab-row{display:flex;border-bottom:2px solid var(--gray-200);margin-bottom:24px}.tab-btn{flex:1;padding:10px;background:none;border:none;cursor:pointer;font-size:14px;font-weight:500;color:var(--gray-600);border-bottom:2px solid transparent;margin-bottom:-2px;transition:color .15s,border-color .15s}.tab-btn.active{color:var(--primary);border-bottom-color:var(--primary)}.tab-btn:hover:not(.active){color:var(--gray-900)}.auth-form{display:flex;flex-direction:column;gap:16px}.field{display:flex;flex-direction:column;gap:6px}.field span{font-size:13px;font-weight:500;color:var(--gray-600)}.field input{border:1px solid var(--gray-200);border-radius:var(--radius);padding:10px 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New,Courier,monospace;-webkit-user-select:all;user-select:all}.pairing-hint{font-size:13px;color:var(--gray-600);line-height:1.6;margin-bottom:0!important}.branch-page{max-width:760px;display:flex;flex-direction:column;height:calc(100vh - 60px);padding-bottom:0}.branch-page-header{display:flex;align-items:center;gap:16px;margin-bottom:20px;flex-shrink:0}.branch-page-title{display:flex;align-items:center;gap:12px}.branch-page-title h2{font-size:20px;font-weight:700}.back-btn{flex-shrink:0}.offline-notice{background:#fff;border-radius:var(--radius);border:1px solid var(--gray-200);padding:48px 40px;text-align:center;max-width:480px;margin:0 auto}.offline-icon{font-size:40px;color:var(--warn-text);margin-bottom:16px}.offline-notice h3{font-size:18px;font-weight:600;margin-bottom:12px}.offline-notice p{color:var(--gray-600);margin-bottom:12px;line-height:1.6;font-size:14px}.chat-window{background:#fff;border:1px solid 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.15s;max-width:100%}.example-pill:hover{background:var(--primary);color:#fff;border-color:var(--primary)}.message{display:flex}.message-user{justify-content:flex-end}.message-assistant,.message-error{justify-content:flex-start}.message-bubble{max-width:82%;padding:11px 15px;border-radius:12px;font-size:14px;line-height:1.65}.user-bubble{background:var(--primary);color:#fff;border-radius:12px 12px 4px}.assistant-bubble{background:var(--gray-100);color:var(--gray-900);border-radius:12px 12px 12px 4px}.error-bubble{background:var(--error-bg);color:var(--error);border:1px solid var(--error-border);border-radius:12px 12px 12px 4px}.message-content{white-space:pre-wrap;word-break:break-word}.message-meta{font-size:11px;color:var(--gray-400);margin-top:6px}.loading-bubble{padding:14px 20px}.dot-pulse{display:inline-block;position:relative;width:6px;height:6px;border-radius:50%;background:var(--gray-400);animation:dot-bounce 1.4s ease-in-out infinite;box-shadow:14px 0 0 -1px var(--gray-400),28px 0 0 -1px var(--gray-400)}@keyframes dot-bounce{0%,60%,to{transform:translateY(0)}30%{transform:translateY(-6px)}}.chat-input-row{display:flex;gap:8px;align-items:center;flex-shrink:0;padding-bottom:24px}.chat-input{flex:1;border:1px solid var(--gray-200);border-radius:var(--radius);padding:10px 14px;font-size:14px;color:var(--gray-900);transition:border-color .15s,box-shadow .15s;background:#fff;font-family:inherit}.chat-input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #2563eb1a}.chat-input:disabled{background:var(--gray-50);color:var(--gray-400);cursor:not-allowed}@media(max-width:600px){.header{padding:0 16px}.header-email{display:none}.page{padding:20px 16px}.auth-card{padding:28px 20px}.modal{padding:24px 20px}.branch-page{height:calc(100vh - 60px)}.message-bubble{max-width:92%}}